Authorship：Corresponding author   Language：Japanese   Publisher：金原出版(株)  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：English   Publishing type：Research paper (scientific journal)  

PURPOSE: Ureaplasma urealyticum is a rare pathogen associated with septic arthritis that predominantly affects patients with hypogammaglobulinemia. Bacterial identification of fastidious organisms is challenging because they are undetectable by routine culture testing. To the best of our knowledge, this is the first report of septic arthritis induced by U. urealyticum infection in Japan. CASE DESCRIPTION: We describe the case of a 23-year-old Japanese female with secondary hypogammaglobulinemia (serum immunoglobulin level < 500 mg/dL), identified 8 years after treatment with rituximab. The patient presented with persistent fever and polyarthritis that were unresponsive to ceftriaxone and prednisolone. Contrast-enhanced computed tomography and gallium-67 scintigraphy revealed effusion and inflammation in the left sternoclavicular, hip, wrist, knee, and ankle joints. Although Gram staining and bacterial culture of the drainage fluid from the left hip joint were negative, the condition exhibited characteristics of purulent bacterial infection. The patient underwent empirical treatment with doxycycline, and her symptoms promptly resolved. Subsequent 16S ribosomal RNA (rRNA) gene sequencing of the joint fluid confirmed the presence of U. urealyticum, leading to the diagnosis of septic arthritis. Combination therapy with doxycycline and azithromycin yielded a favorable recovery from the inflammatory status and severe arthritic pain. CONCLUSION: This case highlights U. urealyticum as a potential causative agent of disseminated septic arthritis, particularly in patients with hypogammaglobulinaemia. The 16S rRNA gene analysis proved beneficial for identifying pathogens in culture-negative specimens, such as synovial fluid, in suspected bacterial infections.

DOI： 10.1007/s15010-024-02301-1

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Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Language：English   Publishing type：Research paper (scientific journal)  

Achondroplasia (ACH) is the most common form of skeletal dysplasia characterized by a rhizomelic short stature. Radiological skeletal findings in pediatric and adult patients with ACH include short long bones, a relatively longer fibula compared to the tibia, a narrow lumbar interpedicular distance, and a hypoplastic iliac wing. Nonetheless, the characteristics of skeletal growth during the neonatal and infantile periods have scarcely been explored. Therefore, this retrospective study aimed to analyze the radiological skeletal growth during the neonatal and infantile periods in 41 Japanese patients with genetically confirmed ACH. The length of long bones in the upper and lower limbs and the lumbar interpedicular distances at L1 and L4 were measured. These parameters showed significant positive correlations with age. The upper segment-to-lower segment ratio in the lower limbs resembled the data of healthy controls from previous reports. The L1/L4 and fibula/tibia ratios increased with age, suggesting that some representative skeletal phenotypes of ACH were less distinct during the neonatal and infantile periods. In conclusion, for the first time, this study radiologically characterized skeletal growth during the neonatal and infantile periods of patients with genetically confirmed ACH.

DOI： 10.1002/ajmg.a.63525

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Authorship：Corresponding author   Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Authorship：Lead author   Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

Most patients with developmental dysplasia of the hip (DDH) now receive closed-reduction treatment within 6 months after birth. The long-term outcomes of patients with late-detection DDH have remained unclear. We reviewed the clinical records of 18 patients who underwent Colonna capsular arthroplasty (n=8) or closed reduction (n=10) for developmental dysplasia of the hip as infants or young children and underwent total hip arthroplasty approximately in midlife. Both the Colonna capsular arthroplasty and closed reduction groups achieved good clinical results after total hip arthroplasty. However, the operating time was longer and the improvements of hip range of motion and clinical score were significantly worse in the Colonna capsular arthroplasty group than in the closed reduction group.

DOI： 10.18926/AMO/66159

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

The acetabular labrum enhances hip joint stability and plays a key role in osteoarthritis (OA) progression. Labral nerve endings contribute to hip OA pain. Moreover, vascular endothelial growth factor (VEGF) and nerve growth factor (NGF) are associated with pain. Consequently, we analysed VEGF and NGF expression levels in the labrum and their roles in OA. Labra obtained from OA patients were stained immunohistochemically, and labral cells were cultured and subjected to a reverse transcription (RT)-polymerase chain reaction (PCR) to analyse VEGF and NGF mRNA expression. VEGF and NGF expression were compared in each region of the labrum. Correlations between VEGF and NGF expression and age, body mass index, Kellgren-Lawrence grade, Harris Hip Score, the visual analogue scale (VAS), and Krenn score were analysed, and the RT-PCR confirmed the findings. VEGF and NGF expression were high on the labral articular side, negatively correlated with the Krenn score, and positively correlated with the VAS in early OA. VEGF and NGF mRNA expression increased significantly in patients with severe pain and decreased significantly in severely degenerated labra. In early OA, VEGF and NGF expression in the acetabular labrum was associated with the occurrence of hip pain; therefore, these factors could be effective targets for pain management.

DOI： 10.3390/ijms24032926

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Language：English   Publishing type：Research paper (scientific journal)  

Osteoarthritis (OA) occurs not only in the knee but also in peripheral joints throughout the whole body. Previously, we have shown that the expression of cellular communication network factor 3 (CCN3), a matricellular protein, increases with age in knee articular cartilage, and the misexpression of CCN3 in cartilage induces senescence-associated secretory phenotype (SASP) factors, indicating that CCN3 promotes cartilage senescence. Here, we investigated the correlation between CCN3 expression and OA degenerative changes, principally in human femoral head cartilage. Human femoral heads obtained from patients who received total hip arthroplasty were categorized into OA and femoral neck fracture (normal) groups without significant age differences. Gene expression analysis of RNA obtained from femoral head cartilage revealed that CCN3 and MMP-13 expression in the non-weight-bearing part was significantly higher in the OA group than in the normal group, whereas the weight-bearing OA parts and normal cartilage showed no significant differences in the expression of these genes. The expression of COL10A1, however, was significantly higher in weight-bearing OA parts compared with normal weight-bearing parts, and was also higher in weight-bearing parts compared with non-weight-bearing parts in the OA group. In contrast, OA primary chondrocytes from weight-bearing parts showed higher expression of CCN3, p16, ADAMTS4, and IL-1β than chondrocytes from the corresponding normal group, and higher ADAMTS4 and IL-1β in the non-weight-bearing part compared with the corresponding normal group. Acan expression was significantly lower in the non-weight-bearing group in OA primary chondrocytes than in the corresponding normal chondrocytes. The expression level of CCN3 did not show significant differences between the weight-bearing part and non-weight-bearing part in both OA and normal primary chondrocytes. Immunohistochemical analysis showed accumulated CCN3 and aggrecan neoepitope staining in both the weight-bearing part and non-weight-bearing part in the OA group compared with the normal group. The CCN3 expression level in cartilage had a positive correlation with the Mankin score. X-ray analysis of cartilage-specific CCN3 overexpression mice (Tg) revealed deformation of the femoral and humeral head in the early stage, and immunohistochemical analysis showed accumulated aggrecan neoepitope staining as well as CCN3 staining and the roughening of the joint surface in Tg femoral and humeral heads. Primary chondrocytes from the Tg femoral head showed enhanced expression of Ccn3, Adamts5, p16, Il-6, and Tnfα, and decreased expression of Col2a1 and -an. These findings indicate a correlation between OA degenerative changes and the expression of CCN3, irrespective of age and mechanical loading. Furthermore, the Mankin score indicates that the expression level of Ccn3 correlates with the progression of OA.

DOI： 10.3390/ijms232315311

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Other Link： https://search-tp.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2022&ichushi_jid=J02438&link_issn=&doc_id=20220608080001&doc_link_id=%2Fcm4ortho%2F2022%2F003401%2F001%2F0001-0005%26dl%3D0&url=https%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Fcm4ortho%2F2022%2F003401%2F001%2F0001-0005%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Ovid Technologies (Wolters Kluwer Health)  

DOI： 10.2106/jbjs.21.01531

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Language：Japanese   Publisher：(一社)日本移植学会  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publisher：(一社)日本小児整形外科学会  

J-GLOBAL

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：English  

The improved cemented cup technique has attained excellent long-term results in primary total hip arthroplasty. When cup revision surgery was performed, the cemented cup, which was loosened at the bone-cement interface, was easily removed. However, with a well-fixed bone-cement interface, it remains difficult to remove the cemented cup for a revision in the event of a recurring dislocation. In addition, protrusions in the cement can cause unpredictable bone defects. A new removal device was created and used successfully to remove a well-fixed cemented cup safely and efficiently. This report introduces the device and the technique used in cemented cup removal.

DOI： 10.18926/AMO/62817

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PURPOSE: The acetabular labrum plays an important role in joint lubrication, and damage to this structure leads to osteoarthritis. This study aimed to histologically classify the degree of degeneration of the acetabular labrum and to investigate the changes in gene expression induced by mechanical stretching. METHODS: We obtained acetabular labrum cells from patients with hip osteoarthritis during total hip arthroplasty (n = 25). The labrum was stained with safranin O, and images were histologically evaluated using a new parameter, the red/blue (R/B) value. The samples were divided into the degenerated group (D group: n = 18) and the healthy group (H group: n = 7) in accordance with the Kellgren-Lawrence (KL) grade. The cultured acetabular labral cells were subjected to loaded uniaxial cyclic tensile strain (CTS). After CTS, changes in gene expression were examined in both groups. RESULTS: Spearman's correlation analysis revealed that the R/B value was significantly correlated with the KL grade and the Krenn score. The expression levels of genes related to cartilage metabolism, osteogenesis and angiogenesis significantly increased after CTS in the H group, while gene expression in the D group showed weaker changes after CTS than that in the H group compared to the nonstretched control group. CONCLUSIONS: The degree of labral degeneration could be classified histologically using the R/B value and the KL grade. Mechanical stretching caused changes in gene expression that support the pathological features of labral degeneration.

DOI： 10.1177/11207000211044675

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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OBJECTIVE: In this study, we aimed to elucidate the relationship between the duration from diagnosis to femoral head collapse and the collapse rate among patients with pre-collapse osteonecrosis of the femoral head (ONFH). METHODS: In this retrospective, observational, multicenter study, we analyzed 268 patients diagnosed with ONFH and classified them using the Japanese Investigation Committee classification. The primary endpoint was duration from the time of diagnosis to femoral head collapse for each type of ONFH. RESULTS: The 12-, 24-, and 36-month collapse rates among participants were 0%, 0%, and 0% for type A, respectively; 0%, 2.0%, and 10.8% for type B, respectively; 25.5%, 40.8%, and 48.5% for type C-1, respectively; and 57.4%, 70.3%, and 76.7% for type C-2 ONFH, respectively. A comparison of unilateral and bilateral ONFH, using Kaplan-Meier survival curves demonstrated similar collapse rates. CONCLUSIONS: The lowest collapse rate was observed for ONFH type A, followed by types B, C-1, and C-2. Additionally, a direct association was observed between the collapse rate and location of the osteonecrotic lesion on the weight-bearing surface.

DOI： 10.1177/03000605211023336

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INTRODUCTION: Residual acetabular dysplasia of the hip after open reduction can complicate the treatment of developmental dysplasia of the hip (DDH) due to the potential need for corrective surgery. This retrospective study aimed to determine the predictive factors for acetabular development using postoperative radiographs and magnetic resonance imaging (MRI). METHODS: We retrospectively investigated 74 hips of patients with DDH who underwent open reduction after reaching walking age and were followed up radiologically until skeletal maturity. We evaluated the cartilaginous acetabulum and labrum using a new method that measures the cartilaginous and labral landmarks on coronal and axial MR T2*-weighted images in patients aged 5 years. The mean age at the time of surgery was 22 months and that at the final survey was 20 years. Severin classification was determined at the final follow-up. Groups with good (53 hips) and poor (21 hips) outcomes were compared using the postoperative radiographic and MRI parameters recorded at 5 years of age. Factors predicting acetabular development were identified using univariate and multiple logistic analyses. RESULTS: There were no significant differences in the bony-acetabular index (AI) and centre-edge (CE) angle between the good and poor outcome groups. However, the poor outcome group had significantly larger cartilaginous- and labral-AIs but significantly smaller cartilaginous- and labral-CE angles than the good outcome group (both p < 0.05). Multiple logistic regression analysis showed that labral-AI and labral-CE angle were predictors of acetabular development after open reduction for DDH, and their optimal cut-offs were 4° (77% sensitivity, 76% specificity) and 37° (68% sensitivity, 85% specificity), respectively. DISCUSSION: Normal cartilaginous acetabulum development occurs in childhood, and evaluation using only radiographs is difficult. However, labral-AI ⩾4° and labral-CE angle <37° on MRI at 5 years of age offer useful indications for corrective surgery in patients with DDH.

DOI： 10.1177/11207000211004917

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Language：English   Publishing type：Research paper (scientific journal)  

This retrospective study sought to elucidate the incidence rates of roof impaction (RI) and marginal impaction (MI) and radiological and clinical outcomes of open reduction and internal fixation (ORIF) for RI and MI in geriatric acetabular fractures. The cases of 68 patients aged ≥ 65 years (mean 71 years) treated with ORIF were analyzed. MI was present in 12 fractures (67%) and an RI of the weight-bearing surface was present in 24 (46%) of the potential fracture types. Regarding the reduction quality, 54% of the reductions were graded as anatomical, 37% as imperfect, and 9% as poor. In the clinical evaluations of the 45 patients who had > 1-year follow-up (follow-up rate: 66.2%), 18% were graded as excellent, 53% as good, 16% as fair, and 13% as poor. An anatomic reduction was strongly associated with good or excellent clinical and radiological outcomes. CT was superior to radiographs for detecting the residual displacement postoperatively. Postoperative deep infection occurred in four patients. Three patients (6.7%) underwent a total hip arthroplasty conversion due to secondary osteoarthritis of the hip. We recommend ORIF as the preferred surgical treatment option for displaced acetabular fractures in elderly patients.

DOI： 10.18926/AMO/61895

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：English   Publishing type：Research paper (scientific journal)  

In bipolar hemiarthroplasty (BHA), it is important to preserve soft tissue to reduce the risk of postoperative dislocation. A variety of surgical approaches for BHA are available, but extra care is needed with muscle- and tendon-preserving approaches in geriatric patients. We investigated the usefulness of BHA using a conjoined tendon-preserving posterior (CPP) approach, in which only the external obturator muscle is dissected, in geri-atric patients. We retrospectively analyzed the cases of 40 femoral neck fracture patients (10 men, 30 women) aged ≥ 80 years who underwent BHA using the CPP approach. The patients' average age was 85.8 years (80-94 years). We examined the operation time, bleeding, preservation of short external rotator muscles, complica-tions, and stem alignment and subsidence from postoperative radiographs. Although gemellus inferior muscle injury was detected in 4 patients (10%), the hip joint stability was very excellent in all cases. There was no intraoperative fracture or postoperative dislocation. On postoperative radiographs, all femoral stems were in a neutral position. There was no stem subsidence in all 40 patients. BHA using the CPP approach appeared to be useful even in geriatric patients.

DOI： 10.18926/AMO/61430

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Language：English   Publishing type：Research paper (scientific journal)  

Intra-operative acetabular fracture is a total hip arthroplasty complication that can occur during cementless cup insertion, especially in osteoporotic patients. We conducted this biomechanical study to investigate the impact resistance of the acetabulum with simulated bones of different density by drop-weight impact testing. Low- and high-density polyurethane foam blocks were used as osteoporotic and healthy bone models, respectively. Polyurethane blocks were used as the acetabular cancellous bone. Composite sheets were used as the acetabu-lum's medial cortex. The testing revealed that the osteoporotic bone model's impact resistance was significantly lower than that the healthy bone model'. In the healthy bone model, even thin acetabular cancellous bone with ≥ 1 mm acetabulum medial cortex was less likely to fracture. In the osteoporotic bone model, fracture was pos-sible without ≥ 1 mm medial cortex of the acetabulum and thick acetabular cancellous bone. Although impac-tion resistance differs due to bone quality, the impaction resistance in this osteoporotic bone model was equiv-alent to that healthy bone model's when a thick medial wall was present. To avoid intra-operative acetabulum fracture, surgeons should consider both the bone quality and the thicknesses of the medial cortex and acetabu-lar cancellous bone.

DOI： 10.18926/AMO/61437

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2020&ichushi_jid=J02438&link_issn=&doc_id=20201001180024&doc_link_id=%2Fcm4ortho%2F2020%2F003202%2F024%2F0339-0342%26dl%3D0&url=https%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Fcm4ortho%2F2020%2F003202%2F024%2F0339-0342%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

Early prediction of future acetabular development is important to determine an additional surgery for developmental dysplasia of the hip (DDH). The purpose of this study was to investigate the predictive factors of acetabular development using MRI. We retrospectively investigated dislocated 40 hips and 34 normal hips in 37 pediatric patients (9 males and 28 females) with DDH who underwent open reduction after walking age. We evaluated the cartilaginous acetabulum and labrum of the patients using coronal MRI T2*-weighted images at 5 years of age. The mean age at the time of surgery was 22 months, and the mean age at the final survey was 19 years. We divided patients into two groups in accordance with the Severin classification at the final follow-up. Groups with good outcomes (affected 26 hips and unaffected 27 hips) and poor outcomes (14 hips and 7 hips) were compared using the MRI parameters on each side. Predictive factors of acetabular development were identified using univariate and multiple logistic regression analyses. Using multiple logistic regression analysis, labral acetabular roof depth and labral hip center distance at 5 years of age represented predictors after open reduction (odds ratio 0.27, P = 0.035; odds ratio 3.4, P = 0.028, respectively) on the affected side, and bony hip center distance represented a predictor on the unaffected side (odds ratio 2.6, P = 0.049). Acetabular development in the unaffected side could be predicted by bony assessment, while acetabular development in the affected side had to be assessed by labrum using MRI.

DOI： 10.1097/BPB.0000000000000799

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Inadequate acetabular component orientation is associated with postoperative impingement, dislocation, and accelerated polyethylene wear. Computed tomography (CT)-based navigation systems provide accuracy for total hip arthroplasty (THA) but are not available in all facilities. Accelerometer-based navigation systems are inexpensive, but their accuracy remains undetermined. This study compares the accuracy of cup orientation in THA using CT-based and accelerometer-based navigation systems. METHODS: This retrospective study included 35 consecutive patients (11 males, 24 females; mean age, 65 years) who underwent primary cementless THA via an anterolateral approach in the supine position. Both CT-based and accelerometer-based navigation systems were used simultaneously. The accuracy of cup orientation was compared between the two systems using postoperative CT. RESULTS: The accuracy of cup inclination was 2.7° ± 2.0° in the CT-based group and 3.3° ± 2.4° in the accelerometer-based group. The accuracy of cup anteversion was 2.8° ± 2.6° in the CT-based group and 3.4° ± 2.2° in the accelerometer-based group. No significant difference was observed in cup inclination (p = 0.29) or cup anteversion (p = 0.34) between CT-based and accelerometer-based navigation. CONCLUSIONS: The accuracy of cup positioning did not differ significantly between CT-based and accelerometer-based navigation systems.

DOI： 10.1186/s13018-020-01673-y

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2020&ichushi_jid=J02438&link_issn=&doc_id=20200602230024&doc_link_id=%2Fcm4ortho%2F2020%2F003201%2F024%2F0113-0117%26dl%3D0&url=http%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Fcm4ortho%2F2020%2F003201%2F024%2F0113-0117%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: The accuracies of various navigation systems in total hip arthroplasty (THA) have been described; however, the accuracy of cup orientation with an accelerometer-based navigation system has not been reported. The purpose of this study was to compare the accuracies of computed tomography (CT)- and accelerometer-based navigation systems for cup orientation in THA. METHODS: In this prospective study, 30 patients who underwent cementless THA via anterolateral approach in the lateral decubitus position were analysed. A CT-based navigation system (30 hips) and an accelerometer-based navigation system (30 hips) were used simultaneously. The accuracy of cup orientation (absolute difference between intraoperative vs. postoperative measurements) was compared between the navigation systems using postoperative CT. RESULTS: The accuracy of cup inclination was 3.2 ± 2.4° in the CT-based navigation group and 4.1 ± 3.7° in the accelerometer-based navigation group (p = 0.3035). The accuracy of cup anteversion was 3.0° ± 2.5° in the CT-based navigation group and 6.8° ± 4.8° in the accelerometer-based navigation group. Cup anteversion was significantly more accurate with the CT-based navigation system than with accelerometer-based navigation (p = 0.0009). Multiple regression analysis demonstrated that the malposition in cup anteversion was positively correlated with the change in pelvic tilt and loosening of the reference antenna. CONCLUSIONS: Although, these results are only true for this specific accelerometer system, cup positioning was significantly more accurate with the CT-based navigation system than an accelerometer-based navigation in the lateral decubitus position. This is because of considerable discrepancies in the sagittal pelvic tilt, resulting in variability in cup anteversion angle with the use of an accelerometer-based navigation system.

DOI： 10.1177/1120700020904940

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Idiopathic chondrolysis of the hip (ICH), a very rare disorder of unknown etiology, occurs mainly in female adolescents. Characterized by pain, limp, stiffness and radiological narrowing joint space from the rapid destruction of the articular cartilage, ICH sometimes results in ankyloses. We present the case of a 10-year-old girl diagnosed with ICH based on arthroscopic inspection and synovium biopsy. The femoral deformity appeared gradually, like a cam-type femoroacetabular impingement. She was treated with intensive rehabilitation and immunosuppressive drug. We later performed an arthroscopic bumpectomy for residual symptoms. She achieved a favorable outcome as a 15-year-old at the latest follow-up.

DOI： 10.18926/AMO/57957

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We investigated the relationship between the initial contact status and stress shielding in total hip arthroplasty (THA) using fit-and-fill type straight-stem implants. In addition we evaluated the clinical and radiographic outcomes. Subjects were 100 hips of 94 patients who underwent THA and were followed-up for ≥10 years. Contact areas with the femoral cortical bone were investigated according to the zonal distribution of Gruen using postoperative CT images. Depending on the number of contact areas, the patients were classified into high contact [HC], medium contact [MC], and low contact [LC] groups. Radiographic and clinical outcomes were evaluated. In the HC group (20 hips), severe stress shielding was observed in 12 hips, which was statistically significant (p=0.008). In the LC group (29 hips), mild stress shielding was observed in 27 hips which was statistically significant (p<0.001). No significant differences were observed among the 3 groups in clinical outcomes, Harris hip score (p=0.719) or Japanese Orthopedic Association (JOA) score (p=0.301). In insertion of cementless collared fit-and-fill type straight-stem implants, severe late stress shielding of the femoral bone may occur if high contact of the femoral component is achieved. However, the degree of stress shielding does not result in adverse clinical outcomes.

DOI： 10.18926/AMO/57947

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

INTRODUCTION: Adequate initial stability of the acetabular cup is essential for total hip arthroplasty (THA). However, changes in the alignment of the acetabular component caused by screw fixation are concerning in patients with inadequate bone stock. This study aimed to investigate the effects of screw fixation on the alignment of the acetabular component in THA patients with hip dysplasia. METHODS: We retrospectively examined 256 hips (range 28-87 years) that underwent THA using a navigation system. Patients were divided into 2 groups based on the presence or absence of changes in the alignment of the intraoperative acetabular cup, and univariate and multivariate analyses were performed to identify factors that were predictive of changes in acetabular component alignment after screw fixation in 2 dimensions: inclination and anteversion. RESULTS: Screw fixation led to a mean change in inclination of 1.6° (range 0-10°) and a mean change in anteversion of 1.4° (range 0-14°). The Crowe classification, the presence of bone cysts, and the use of an inferior quadrant screw were identified as factors that correlated with acetabular cup alignment changes in inclination (odds ratios, 6.01, 5.94 and 0.03, respectively). Only the Crowe classification was identified as a factor that correlated with intraoperative alignment changes in anteversion (odds ratio, 2.08). CONCLUSIONS: Screw fixation altered the acetabular cup alignment. The inclination changes were related to the extent of the dysplasia, and the risk was reduced when the inferior quadrant screw was used. Surgeons should use caution during screw fixation in THAs performed on severely dysplastic hips.

DOI： 10.1177/1120700019828708

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2019&ichushi_jid=J00831&link_issn=&doc_id=20191121010033&doc_link_id=10.11359%2Fchubu.2019.863&url=https%3A%2F%2Fdoi.org%2F10.11359%2Fchubu.2019.863&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_2.gif

Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本運動器科学会  

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Language：Japanese   Publisher：(一社)日本関節鏡・膝・スポーツ整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Acetabular dysplasia of the hip following open reduction can complicate the treatment of developmental dysplasia of the hip (DDH). The purposes of this retrospective study were to investigate the long-term results of open reduction performed via an extensive anterolateral approach for DDH after walking age and to predict acetabular development using postoperative radiographs and arthrograms. METHODS: From 1973 to 2001, we performed open reduction for 131 hips in 119 pediatric patients with DDH after failed closed reduction. Of these, 85 hips of 73 patients who underwent arthrography at 5 years old were followed-up radiologically until skeletal maturity. Mean age at the time of surgery was 17 ± 4.6 months (range, 10-33 months), and mean age at final survey was 19 ± 5.7 years (range, 14-33 years). Mean follow-up time was 17.7 ± 5.8 years (range, 13-32 years). Groups with satisfactory outcomes (66 hips) and unsatisfactory outcomes (19 hips) according to the Severin classification were compared. Factors predicting acetabular development were identified using univariate and multiple logistic analyses. RESULTS: Univariate analysis showed a significant between-group difference in acetabular index (AI) at 2 months postoperatively, and in center-edge (CE) angle, cartilaginous AI (CAI), and cartilaginous CE angle at 5 years old (p < 0.05 each). In multiple logistic regression analysis, CAI at 5 years old represented a predictor of acetabular development after open reduction for DDH (odds ratio, 1.81; 95% confidence interval (CI), 1.04-3.13; p < 0.05). Area under the receiver operating characteristic curve for CAI at 5 years old was 0.93 (95%CI, 0.85-1.0), and the optimal cut-off was 10° (81.8% sensitivity, 92% specificity). CONCLUSIONS: A CAI ≥10° on hip arthrograms at 5 years old may offer a useful indicator of the need for corrective surgery following open reduction after walking age.

DOI： 10.1016/j.jos.2018.09.015

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Medial meniscus posterior root tear (MMPRT) results in joint overloading and degenerative changes in the knee. Favorable clinical outcomes have been reported after transtibial pullout repair of MMPRT. To date, however, in vivo tibial rotational changes before and after root repair remain poorly understood. The purpose of this study was to investigate postoperative changes in tibial rotation following MMPRT pullout repair. HYPOTHESIS: Pathological external rotation of the tibia in the knee-flexed position is caused by MMPRT and is reduced after transtibial pullout repair. PATIENTS AND METHODS: Fifteen patients who underwent MMPRT pullout repair and 7 healthy volunteers were included. Magnetic resonance imaging examinations were performed in the 10° and 90° knee-flexed positions. The angles between the surgical epicondylar axis and a line between the medial border of the patellar tendon and the apex of the medial tibial spine were measured. Baseline was defined as a line lying at a right angle to the other, and a value was positive and negative when the tibia rotated internally and externally, respectively. RESULTS: In the volunteer's normal knees, tibial internal rotation was +1.00°±3.27° at 10° flexion and +4.14°±3.46° at 90° flexion. In the MMPRT preoperative knees, tibial internal rotation was +1.07°±3.01° at 10° flexion and +1.27°±2.96° at 90° flexion. In the postoperative knees, tibial internal rotation was +1.60°±2.85° at 10° flexion and +4.33°±2.89° at 90° flexion. DISCUSSION: This study demonstrates discontinuity of the MM posterior root may induce a pathological external rotation of the tibia during knee flexion and that MMPRT pullout repair reduces the pathological external rotation of the tibia in the knee-flexed position. LEVEL OF EVIDENCE: III, comparative retrospective study.

DOI： 10.1016/j.otsr.2018.10.005

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BACKGROUND: In cases of avulsion fracture of the ischial tuberosity in which the bone fragments are substantially displaced, nonunion may cause pain in the ischial area. Various surgical procedures have been reported, but achieving sufficient fixation strength is difficult. CASE PRESENTATION: We treated a 12-year-old male track-and-field athlete with avulsion fracture of the ischial tuberosity by suture anchor fixation using the suture bridge technique. The boy felt pain in the left gluteal area while running. Radiography showed a left avulsion fracture of the ischial tuberosity with approximately 20-mm displacement. Union was not achieved by conservative non-weight-bearing therapy, and muscle weakness persisted; therefore, surgery was performed. A subgluteal approach was taken via a longitudinal incision in the buttocks, and the avulsed fragment was fixed with five biodegradable suture anchors using the suture bridge technique. CONCLUSIONS: Although the majority of avulsion fractures of the ischial tuberosity can be treated conservatively, patients with excessive displacement require surgical treatment. The suture bridge technique provided secure fixation and enabled an early return to sports activities.

DOI： 10.1186/s12891-018-2377-z

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2019&ichushi_jid=J00831&link_issn=&doc_id=20190412110071&doc_link_id=10.11359%2Fchubu.2019.153&url=https%3A%2F%2Fdoi.org%2F10.11359%2Fchubu.2019.153&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_2.gif

Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：西日本整形・災害外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2018&ichushi_jid=J02438&link_issn=&doc_id=20181019080004&doc_link_id=%2Fcm4ortho%2F2018%2F003002%2F005%2F0189-0194%26dl%3D0&url=https%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Fcm4ortho%2F2018%2F003002%2F005%2F0189-0194%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

Authorship：Lead author   Language：Japanese   Publisher：(株)医学書院  

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2018&ichushi_jid=J01554&link_issn=&doc_id=20180814090015&doc_link_id=10.11477%2Fmf.1408201154&url=https%3A%2F%2Fdoi.org%2F10.11477%2Fmf.1408201154&type=%88%E3%8F%91.jp_%83I%81%5B%83%8B%83A%83N%83Z%83X&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00024_2.gif

Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Acetabular bone cyst is usually associated with dysplastic secondary osteoarthritis of the hip joint. Acetabular reorientation osteotomy is one of the most common therapeutic options for treating patients with hip dysplasia. However, it may be too invasive for athletes and can also lead to some complications including intraoperative fracture and postoperative bone necrosis especially in patients with acetabular large bone cysts. Endoscopic shelf acetabuloplasty offers a less invasive option for athletic patients with dysplasia of severity greater than those indicated for isolated hip arthroscopy. This Technical Note demonstrates endoscopic shelf acetabuloplasty with bone grafting, simultaneously addressing a large bone cyst and acetabular undercoverage, as part of a comprehensive approach addressing chondrolabral pathology while restoring capsular integrity in an athlete with moderate dysplasia.

DOI： 10.1016/j.eats.2018.03.005

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Language：Japanese   Publisher：(一社)日本関節鏡・膝・スポーツ整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.rcot.2018.11.005

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: The accuracy of various navigation systems used for total hip arthroplasty has been described, but no publications reported the accuracy of cup orientation in computed tomography (CT)-based 2D-3D (two-dimensional to three-dimensional) matched navigation. METHODS: In a prospective, randomized controlled study, 80 hips including 44 with developmental dysplasia of the hips were divided into a CT-based 2D-3D matched navigation group (2D-3D group) and a paired-point matched navigation group (PPM group). The accuracy of cup orientation (absolute difference between the intraoperative record and the postoperative measurement) was compared between groups. Additionally, multiple logistic regression analysis was performed to evaluate patient factors affecting the accuracy of cup orientation in each navigation. RESULTS: The accuracy of cup inclination was 2.5° ± 2.2° in the 2D-3D group and 4.6° ± 3.3° in the PPM group (P = .0016). The accuracy of cup anteversion was 2.3° ± 1.7° in the 2D-3D group and 4.4° ± 3.3° in the PPM group (P = .0009). In the PPM group, the presence of roof osteophytes decreased the accuracy of cup inclination (odds ratio 8.27, P = .0140) and the absolute value of pelvic tilt had a negative influence on the accuracy of cup anteversion (odds ratio 1.27, P = .0222). In the 2D-3D group, patient factors had no effect on the accuracy of cup orientation. CONCLUSION: The accuracy of cup positioning in CT-based 2D-3D matched navigation was better than in paired-point matched navigation, and was not affected by patient factors. It is a useful system for even severely deformed pelvises such as developmental dysplasia of the hips.

DOI： 10.1016/j.arth.2017.08.001

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Language：Japanese   Publisher：(一社)日本人工関節学会  

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Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: To compare the plain knee radiograph finding of tibial eminence width between knees with complete discoid lateral meniscus, incomplete discoid lateral meniscus, and normal lateral meniscus. MATERIALS AND METHODS: The study included 27 knees with discoid lateral meniscus, including 13 knees with complete discoid lateral meniscus and 14 knees with incomplete discoid lateral meniscus. A control group of 14 knees with normal lateral meniscus was also included. Tibial eminence width and the lateral slope angle of the medial tibial eminence were assessed using plain frontal knee radiographs. Individual differences in knee size were corrected by dividing tibial eminence width by tibial width to obtain the tibial eminence width percentage. RESULTS: Mean tibial eminence width and tibial eminence width percentage in the complete discoid lateral meniscus group was significant larger than other groups. Mean lateral slope angle in the complete discoid lateral meniscus group was significantly smaller than other groups. A tibial eminence width cut-off of 13.9 mm showed a sensitivity and specificity of 100% and 83%, respectively. A tibial eminence width percentage cut-off of 18.8% showed a sensitivity and specificity of 100% and 90%, respectively. A lateral slope angle cut-off of 27.1° showed a sensitivity and specificity of 71% and 83%, respectively. CONCLUSION: There were clear differences in tibial eminence width, tibial eminence width percentage, and lateral slope angle between the complete discoid lateral meniscus group and the other groups. The plain radiographic parameters identified by this study could be useful for complete discoid lateral meniscus screening. STUDY DESIGN: Clinical.

DOI： 10.1016/j.jos.2017.07.011

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Language：English   Publishing type：Research paper (scientific journal)  

We retrospectively reviewed 29 hips in which intertrochanteric osteotomies were performed for severe slipped capital femoral epiphyses. Mean age at surgery: 12.6 years. Mean follow-up period: 6 years. At the final follow-up evaluation, one patient had coxalgia, and six hips showed a limited range of motion. A pistol-grip deformity was observed in 13 hips, osteoarthritis in two hips, and a bump existed in 19 hips on the latest radiographs. Gradual remodeling of the bumps was observed post-operatively in 22 hips. The mean α and β angles and offset α and β improved over time. The remodeling proceeded rapidly for 1 year post-surgery. We compared hips classified as β angles of ≥ 63° to < 63° at the final follow-up evaluation, the mean β angle 1 year post-surgery, and the mean ratio of improvement of the β angle per year from 1 year post-surgery to the final follow up, which differed significantly. Nearly all of the patients who underwent intertrochanteric osteotomies had residual morphologic abnormalities, but few had clinical symptoms. The β angle 1 year post-surgery and the ratio of remodeling of the bump from 1 year post-surgery to the final follow-up can be regarded as a potential predictor of morphologic results after intertrochanteric osteotomy.

DOI： 10.18926/AMO/55308

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Masson SAS  

DOI： 10.1016/j.rcot.2017.02.008

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Masson SAS  

DOI： 10.1016/j.otsr.2017.01.005

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Language：Japanese   Publisher：(一社)日本関節鏡・膝・スポーツ整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

Medial meniscus posterior root has an important role in the maintenance of knee articular cartilage. Although pullout repair of the medial meniscus posterior root tear has become a gold standard, it has several difficulties for suturing. We have developed a modified Mason-Allen suture technique using the FasT-Fix all-inside suture device combined with Ultrabraid. The present suture technique allows a strong grasping of the medial meniscus posterior horn for arthroscopic pullout repair.

DOI： 10.1007/s00590-017-1930-z

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Publishing type：Research paper (scientific journal)  

Scopus

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(一社)日本整形外科スポーツ医学会  

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Language：Japanese   Publisher：(一社)日本関節鏡・膝・スポーツ整形外科学会  

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Publishing type：Research paper (scientific journal)   Publisher：SAGE Publications  

<sec><title>Purpose</title> A retrospective study to evaluate the clinical and radiographic outcome of the Summit primary total hip arthroplasty (THA) at a minimum follow-up of 4 years.

</sec><sec><title>Methods</title> 87 hips in 84 Japanese patients underwent THA using Summit stems. 3 patients were lost to follow-up, and 4 patients were excluded because a Summit stem was judged to be inappropriate for their narrow femoral canals. The remaining 80 hips in 77 patients were evaluated. Mean age was 66 years (range, 33-86 y). Mean postoperative follow-up period was 52 months (range, 48-66 m).

</sec><sec><title>Results</title> There was no early stem subsidence after surgery. Of the 80 hips, 60 (75%) showed radiographic signs of stem osseointegration including zones 3 and 5 at final follow-up. Stress shielding occurred in 50 hips (62.5%), and third-degree stress shielding was observed in 12 hips (15%). 3 patients experienced postoperative thigh pain due to distal fixation.

</sec><sec><title>Conclusions</title> These short-term results indicate that the Summit stem achieved good initial fixation, although there were some cases of distal fixation. Careful long-term follow-up and observation will be necessary for hips in which stress shielding occurs.

</sec>

DOI： 10.5301/hipint.5000287

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Other Link： http://journals.sagepub.com/doi/full-xml/10.5301/hipint.5000287

Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Postoperative pain relief can be achieved with various modalities. However, there are only few reports that have analyzed postoperative analgesic techniques in total hip arthroplasty patients. The aim of this retrospective study was to compare the postoperative outcomes of three different analgesic techniques after total hip arthroplasty. METHODS: We retrospectively reviewed the influence of three analgesic techniques on postoperative rehabilitation after total hip arthroplasty in 90 patients divided into three groups (n = 30 patients per group). Postoperative analgesia consisted of continuous epidural analgesia (Epi group), patient-controlled analgesia with morphine (PCA group), or a continuous femoral nerve block (CFNB group). We measured the following parameters relating to postoperative outcome: visual analog scale scores, the use of supplemental analgesia, side effects, length of the hospital stay, plasma D-dimer levels, and the Harris hip score. RESULTS: Each group had low pain scores with no significant differences between the groups. The PCA group had a lower frequency of supplemental analgesia use compared to the Epi and CFNB groups. Side effects (nausea/vomiting, inappetence) and day 7 D-dimer levels were significantly lower in the CFNB group (p < 0.05). There were no significant differences between the groups in terms of the length of the hospital stay or the Harris hip score. CONCLUSIONS: Although there were no clinically significant differences in outcomes between the three groups, the CFNB provided good pain relief which was equal to that of the other analgesics with fewer side effects and lower D-dimer levels in hospitalized patients following total hip arthroplasty.

DOI： 10.4055/cios.2015.7.2.164

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Authorship：Lead author   Language：Japanese   Publisher：金原出版(株)  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Authorship：Lead author   Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2014&ichushi_jid=J00831&link_issn=&doc_id=20141216150097&doc_link_id=10.11359%2Fchubu.2014.1161&url=https%3A%2F%2Fdoi.org%2F10.11359%2Fchubu.2014.1161&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_2.gif

Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2014&ichushi_jid=J00831&link_issn=&doc_id=20141002180003&doc_link_id=10.11359%2Fchubu.2014.705&url=https%3A%2F%2Fdoi.org%2F10.11359%2Fchubu.2014.705&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_2.gif

Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Authorship：Lead author   Language：Japanese   Publisher：(一社)日本関節鏡・膝・スポーツ整形外科学会  

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Authorship：Lead author   Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Language：Japanese   Publisher：THE CENTRAL JAPAN ASSOCIATION OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY  

DOI： 10.11359/chubu.2014.1071

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Other Link： http://search.jamas.or.jp/link/ui/2015166083

Language：Japanese   Publisher：The Chugoku-Shikoku Orthopaedic Association  

Stress fractures of the lateral malleolus of the ankle joint are rare. Almost all cases are treated conservatively, for example with a casting and/or protected weight-bearing. We report a case of stress fracture of the lateral malleolus of the ankle joint for which correction osteotomy was needed. The patient, a 41-year-old woman, complained of pain in her right ankle after she had starting jogging one month previously. X-ray and CT examinations revealed a distal fibula fracture. X-ray showed a sclerotic change valgus angulation deformity, which seemed to put the malleolus at risk of stress fracture.Therefore, we performed surgical correction.

DOI： 10.11360/jcsoa.26.145

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Other Link： http://search.jamas.or.jp/link/ui/2014365478

Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Many difficulties are associated with treating fractures of the posterior condyle of the femur (Hoffa fractures). Anatomical reduction and internal fixation are optimum for such intra-articular fractures. Some surgeons use anteroposterior screws to achieve direct stability. However, screw fixation is not adequate in some cases. To increase stability, we treat Hoffa fractures with a posterior buttress plate; we use a twisted, 1/3 tubular plate at the posterior surface and a supplementary, locking compression plate (LCP) for additional stability. METHODS: Patients who had sustained Hoffa fractures between January 2006 and March 2009 were included in this study. Patients comprised three males and two females with a mean age of 73.6 years at the time of surgery. A 3.5-mm 1/3 tubular plate was twisted and applied to the posterolateral aspect of the distal femur. This was combined with an LCP on the distal femur to achieve a rafting effect. RESULTS: All fractures were healed within 15 weeks. There were no instances of nonunion, infection, or implant removal. The mean range of motion was -3° to 121°. Four patients had no pain in the treated limb and one had mild pain on weight bearing. The average Oxford Knee Score was 44.6 points. All patients achieved satisfactory joint function and regained their walking ability with good clinical results. CONCLUSIONS: Improved stability associated with this technique enables patients to begin range-of-motion training and return to their normal activities sooner; this resulted in good outcome.

DOI： 10.1007/s00776-013-0410-5

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Authorship：Lead author   Language：Japanese   Publisher：(一社)日本関節鏡・膝・スポーツ整形外科学会  

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Authorship：Lead author   Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2013&ichushi_jid=J00831&link_issn=&doc_id=20130726120082&doc_link_id=10.11359%2Fchubu.2013.701&url=https%3A%2F%2Fdoi.org%2F10.11359%2Fchubu.2013.701&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_2.gif

Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Language：Japanese   Publisher：THE CENTRAL JAPAN ASSOCIATION OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY  

DOI： 10.11359/chubu.2013.1115

CiNii Article

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Language：Japanese   Publisher：THE CENTRAL JAPAN ASSOCIATION OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY  

DOI： 10.11359/chubu.2013.211

CiNii Article

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Language：Japanese   Publisher：The Chugoku-Shikoku Orthopaedic Association  

Posterior condyle fractures of the femur (Hoffa fractures) are generally treated by anterior to posterior-directed screw fixation. However, such screw fixation sometimes failes because of poor bone quality. To enhance the fixation strength, posterior buttress plate was used, and the clinical results including union time, ROM of the knee joint and gait ability were estimated. Although all cases were geriatric fractures, the reduction position was maintained without any displacement. Therefore, the posterior buttress plating method appears to be advantageous in this setting.

DOI： 10.11360/jcsoa.25.247

CiNii Article

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Other Link： http://search.jamas.or.jp/link/ui/2014097067

Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Language：Japanese   Publisher：(一社)日本骨折治療学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：(一社)日本脊椎脊髄病学会  

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Language：Japanese   Publisher：The Chugoku-Shikoku Orthopaedic Association  

The present study examined the short-term results of cementless total hip arthroplasty (THA) using SUMMIT stems. We treated 30 patients during the period between May 2009 and May 2010. The average age of the patients at the time of surgery was 68 years, and the average postoperative follow-up period was 16 months. There was no early stem subsidence after surgery. The average Japanese Orthopaedic Association hip scores increased from a preoperative mean of 42 to a mean of 93 at one year after surgery. No complications occurred. Of the 30 hips, 20 (66%) showed roentgenographic signs of stem osseointegration at one year. Stress shielding occurred in 17 hips (59%), but was not progressive. These short-term data indicate that the SUMMIT stem is capable of delivering good results.

DOI： 10.11360/jcsoa.24.227

CiNii Article

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Other Link： http://search.jamas.or.jp/link/ui/2013107542

Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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Language：Japanese   Publisher：日本静脈学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：中国・四国整形外科学会  

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Language：Japanese   Publisher：(一社)日本骨・関節感染症学会  

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Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

DOI： 10.18885/JJS.0000000951

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Authorship：Lead author,　Corresponding author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

DOI： 10.18885/JJS.0000000945

J-GLOBAL

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

J-GLOBAL

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：Japanese   Publisher：(一社)日本骨代謝学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：日本股関節学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：Japanese   Publisher：(一社)日本小児整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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Language：Japanese   Publisher：日本股関節学会  

J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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DOI： 10.1016/j.rcot.2017.02.008

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Event date： 2020.10.23 - 2020.10.24

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.10.23 - 2020.10.24

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.10.23 - 2020.10.24

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.10.23 - 2020.10.24

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.10.15 - 2020.10.16

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.10.15 - 2020.10.16

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.6.11 - 2020.8.31

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.6.11 - 2020.8.31

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.6.11 - 2020.8.31

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2020.6.11 - 2020.8.31

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.4.10 - 2020.4.11

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2020.2.21 - 2020.2.22

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2020.2.21 - 2020.2.22

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.2.21 - 2020.2.22

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.2.21 - 2020.2.22

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.2.21 - 2020.2.22

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.2.21 - 2020.2.22

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.2.21 - 2020.2.22

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.2.8 - 2020.2.11

Language：English   Presentation type：Poster presentation  

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Event date： 2020.2.8 - 2020.2.11

Language：English   Presentation type：Poster presentation  

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Event date： 2020.2.1

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2020.2.1

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2020.2.1

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2020.2.1

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.11.23 - 2019.11.24

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.11.23 - 2019.11.24

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.11.23 - 2019.11.24

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.11.21 - 2019.11.23

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.11.21 - 2019.11.23

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.11.21 - 2019.11.23

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.11.21 - 2019.11.23

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.11.21 - 2019.11.23

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.10.25 - 2019.10.26

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.10.25 - 2019.10.26

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.10.25 - 2019.10.26

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.10.25 - 2019.10.26

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.10.25 - 2019.10.26

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.10.25 - 2019.10.26

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.10.25 - 2019.10.26

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

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Event date： 2019.10.20 - 2019.10.22

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2019.10.17 - 2019.10.18

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.10.5

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.9.7

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.7.27

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.7.20

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.7.6 - 2019.7.7

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.6.28 - 2019.6.29

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.6.28 - 2019.6.29

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.6.28 - 2019.6.29

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

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Event date： 2019.6.21 - 2019.6.22

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2019.6.13 - 2019.6.15

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.5.9 - 2019.5.12

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.5.9 - 2019.5.12

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.5.9 - 2019.5.12

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.5.9 - 2019.5.12

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.5.9 - 2019.5.12

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.4.5 - 2019.4.6

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.2.15 - 2019.2.16

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.2.15 - 2019.2.16

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.2.15 - 2019.2.16

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.2.15 - 2019.2.16

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Event date： 2019.2.2 - 2019.2.5

Language：English   Presentation type：Poster presentation  

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Event date： 2019.1.19

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.1.19

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.1.19

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.12.14 - 2018.12.15

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.12.14 - 2018.12.15

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2018.12.14 - 2018.12.15

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.11.24 - 2018.11.25

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.11.9 - 2018.11.10

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.10.26 - 2018.10.27

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.10.26 - 2018.10.27

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2018.10.26 - 2018.10.27

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2018.10.26 - 2018.10.27

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.10.20

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.10.11 - 2018.10.12

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2018.10.5 - 2018.10.6

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.9.1

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.9.1

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.8.18

Language：Japanese   Presentation type：Oral presentation (invited, special)  

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Event date： 2018.7.28

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.7.28

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.7.28

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.7.28

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.7.6 - 2018.7.7

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.7.6 - 2018.7.7

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.6.22 - 2018.6.23

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.6.22 - 2018.6.23

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.6.22 - 2018.6.23

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.6.22 - 2018.6.23

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.6.14 - 2018.6.16

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.6.14 - 2018.6.16

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2018.6.14 - 2018.6.15

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2018.5.24 - 2018.5.27

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.5.24 - 2018.5.27

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2018.5.24 - 2018.5.27

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.5.24 - 2018.5.27

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.5.24 - 2018.5.27

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.3.10 - 2018.3.13

Language：English   Presentation type：Poster presentation  

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Event date： 2018.2.23 - 2018.2.24

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.2.23 - 2018.2.24

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.2.23 - 2018.2.24

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.2.23 - 2018.2.24

Language：Japanese   Presentation type：Poster presentation  

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