Journal of Orthopaedic Science最新文献

{"title":"Relationship between lifestyle differences and sarcopenia, muscle mass in patients with rheumatoid arthritis: Comparison of metropolitan and country areas","authors":"Masahiro Tada ,&nbsp;Chika Yoshimura ,&nbsp;Yoshinari Matsumoto ,&nbsp;Koji Mandai","doi":"10.1016/j.jos.2025.07.003","DOIUrl":"10.1016/j.jos.2025.07.003","url":null,"abstract":"<div><h3>Objectives</h3><div>Differences in living environments and lifestyle affect physical activity and the sarcopenia rate in rheumatoid arthritis (RA) patients. This study aimed to investigate the effects of differences in living environment and lifestyle by area of residence on the prevalence rate of sarcopenia, physical activity, and body composition in RA patients.</div></div><div><h3>Methods</h3><div>Patients were divided into metropolitan (n = 77) and country (n = 67) groups by area of residence. Both groups were age- and sex-matched. Body composition was evaluated by a body composition analyzer, and the prevalence of sarcopenia was compared. Physical activity was assessed using the international physical activity questionnaire. Questions regarding means of commuting to hospital, family structure, and occupation type were asked to evaluate living environment and lifestyle. Associations between sarcopenia and lifestyle were investigated by univariate and multivariate analyses.</div></div><div><h3>Results</h3><div>There was no significant difference in the prevalence of sarcopenia between the metropolitan (26.0 %) and country (34.3 %) groups. Muscle mass was significantly higher in the metropolitan group (34.6 kg) than in the country group (32.9 kg; p = 0.026). Transportation physical activity was significantly higher in the metropolitan group (693 METs⋅Min/Week) than in the country group (0 METs⋅Min/Week; p &lt; 0.001). Multivariate logistic regression analysis, adjusted for age, disease duration, DAS28-ESR,mHAQ, and glucocorticoid usage, identified only unemployment as an independent factor associated with sarcopenia (OR: 3.40, 95%CI: 1.10–10.4, p = 0.032).</div></div><div><h3>Conclusions</h3><div>RA patients living in metropolitan areas had significantly higher muscle mass than those living in the countryside. However, there was no significant difference in the prevalence of sarcopenia. Unemployment was identified as an independent factor associated with sarcopenia.</div></div>","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 480-485"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144690613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The utility of apparent diffusion coefficient maps for evaluating chemotherapy response and prognosis in osteosarcoma","authors":"Hiroshi Koike ,&nbsp;Yoshihiro Nishida ,&nbsp;Hiroshi Urakawa ,&nbsp;Kunihiro Ikuta ,&nbsp;Tomohisa Sakai ,&nbsp;Kan Ito ,&nbsp;Shiro Imagama","doi":"10.1016/j.jos.2025.07.006","DOIUrl":"10.1016/j.jos.2025.07.006","url":null,"abstract":"<div><h3>Background</h3><div>Assessing the response to neoadjuvant chemotherapy is crucial for determining surgical treatment strategies and optimizing personalized postoperative care in osteosarcoma patients. The apparent diffusion coefficient, derived from diffusion-weighted imaging, reflects tumor aggressiveness; however, its role in evaluating neoadjuvant chemotherapy response remains unclear. This study aimed to evaluate the utility of apparent diffusion coefficient maps in assessing chemotherapy-induced necrosis and prognosis in osteosarcoma.</div></div><div><h3>Methods</h3><div>Twenty osteosarcoma patients referred to our hospital between 2007 and 2020, for whom apparent diffusion coefficient maps were available, were included. The association between apparent diffusion coefficient values, tumor necrosis rate, and prognosis was analyzed.</div></div><div><h3>Results</h3><div>The study cohort consisted of 14 males and six females, with a median age of 16 years (range, 7–37). Tumor locations included the femur (12 patients), tibia (5), humerus (2), and scapula (1). Significant correlations were found between changes in mean apparent diffusion coefficient values pre- and post-neoadjuvant chemotherapy and tumor necrosis rate (r = 0.61, p &lt; 0.01). Post-chemotherapy mean and minimum apparent diffusion coefficient values were significantly associated with overall survival (p = 0.04 for both).</div></div><div><h3>Conclusions</h3><div>This study demonstrates a strong correlation between chemotherapy effectiveness and apparent diffusion coefficient values in osteosarcoma. Future clinical efforts should focus on integrating apparent diffusion coefficient values into treatment strategies to improve patient outcomes.</div></div>","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 456-465"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144799411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagnostic accuracy of preoperative magnetic resonance arthrography for detecting midsubstance capsular tears: Irregular outline sign","authors":"Kei Matsunaga ,&nbsp;Satoshi Miyake ,&nbsp;Terufumi Shibata ,&nbsp;Shunsuke Kobayashi ,&nbsp;Naofumi Hata ,&nbsp;Masahiko Sakai ,&nbsp;Teruaki Izaki ,&nbsp;Yozo Shibata ,&nbsp;Takuaki Yamamoto","doi":"10.1016/j.jos.2025.09.002","DOIUrl":"10.1016/j.jos.2025.09.002","url":null,"abstract":"<div><h3>Background</h3><div>Traumatic anterior shoulder instability is caused by functional and structural failure of the inferior glenohumeral ligament–labrum complex. One such cause is midsubstance capsular tear, which is a rare condition with a prevalence of 1.5 %–4.0 %. It is crucial to obtain accurate preoperative imaging of a midsubstance capsular tear because of the high skill level required for surgical treatment. However, reproducible and reliable radiological features for the diagnosis of midsubstance capsular tear have not been identified, and although the distorted shape of the magnetic resonance arthrography is reportedly a sign of midsubstance capsular tear, its reproducibility and reliability have not been adequately demonstrated. The present study investigated the diagnostic accuracy of the Irregular Outline (IO) sign on magnetic resonance arthrography for diagnosing midsubstance capsular tear.</div></div><div><h3>Methods</h3><div>This retrospective study included 204 shoulders with traumatic anterior shoulder instability after excluding patients with previous surgeries, fractures, or poor-quality magnetic resonance arthrography images. Two examiners evaluated the magnetic resonance arthrography images for the IO sign, and the presence of midsubstance capsular tear was confirmed via arthroscopic records.</div></div><div><h3>Results</h3><div>Midsubstance capsular tear was identified in 12 of 204 shoulders (5.9 %). The IO sign demonstrated high diagnostic accuracy with a sensitivity of 85.4 %, specificity of 94.9 %, positive predictive value of 51.8 %, and negative predictive value of 99.1 %. The inter-rater and intra-rater reliabilities were high, with kappa coefficients above 0.8.</div></div><div><h3>Conclusion</h3><div>The IO sign on magnetic resonance arthrography is a reliable indicator with high sensitivity and specificity for diagnosing midsubstance capsular tear. The accurate preoperative diagnosis of a midsubstance capsular tear can assist in planning appropriate surgical interventions, especially for shoulder surgeons with less experience. Further studies are needed to confirm these findings in larger populations and with standardized imaging equipment.</div></div>","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 349-352"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145274921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preoperative undernutrition in older people with adult spinal deformities is associated with worse postoperative sagittal vertical axis","authors":"Jun Ouchida ,&nbsp;Hiroaki Nakashima ,&nbsp;Sadayuki Ito ,&nbsp;Naoki Segi ,&nbsp;Tokumi Kanemura ,&nbsp;Tetsuya Ohara ,&nbsp;Taichi Tsuji ,&nbsp;Ryuichi Shinjo ,&nbsp;Ippei Yamauchi ,&nbsp;Yukihito Ode ,&nbsp;Shiro Imagama","doi":"10.1016/j.jos.2025.07.001","DOIUrl":"10.1016/j.jos.2025.07.001","url":null,"abstract":"<div><h3>Background</h3><div>The impact of preoperative nutritional status on postoperative clinical outcomes in older adults undergoing surgery for adult spinal deformity (ASD) remains unclear. This study aimed to investigate the association between preoperative nutritional status and postoperative clinical and radiological outcomes in patients undergoing surgery for ASD.</div></div><div><h3>Methods</h3><div>A total of 117 patients (mean age: 73.3 ± 5.4 years; 77 women) who underwent fusion of ≥3 vertebrae for ASD were retrospectively enrolled from a multicenter database. Nutritional status was assessed using the Controlling Nutritional Status (CONUT) scale, which is based on serum albumin, total lymphocyte count, and total cholesterol levels, with scores ranging from 0 to 10. Patients were classified into two groups according to their nutritional status: the undernutrition (UN) group (CONUT score ≥2) and the normal nutrition (N) group (CONUT score 0–1). Multivariate regression analysis was performed to identify independent predictors of postoperative sagittal alignment deterioration.</div></div><div><h3>Results</h3><div>The N group included 67 patients, while the UN group included 50 patients. At 2 years postoperatively, the UN group exhibited a significantly greater sagittal vertical axis (SVA) (56.5 ± 47.5 mm vs. 44.2 ± 40.2 mm, P = 0.007) and a smaller spino-femoral angle (SFA) (194.4 ± 19.3° vs. 202.6 ± 19.2°, P = 0.029) compared to the N group. Multivariate analysis revealed that preoperative undernutrition was an independent predictor of postoperative SVA deterioration.</div></div><div><h3>Conclusions</h3><div>Preoperative undernutrition was associated with increased SVA and decreased SFA at 2 years postoperatively in older patients undergoing surgery for ASD. These findings suggest that preoperative nutritional status may influence postoperative outcomes in this population, highlighting the importance of nutritional screening and intervention prior to surgery.</div></div>","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 277-283"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144731915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of different types of prosthetic feet in patients with unilateral transtibial amputation; patient perspective","authors":"Gizem Kılınç Kamacı,&nbsp;Şahide Eda Artuç,&nbsp;Hatice Ceylan,&nbsp;Elif Tekin,&nbsp;Onur Kanlıoğlu,&nbsp;Merve Örücü Atar,&nbsp;Yasin Demir,&nbsp;Koray Aydemir","doi":"10.1016/j.jos.2025.07.007","DOIUrl":"10.1016/j.jos.2025.07.007","url":null,"abstract":"<div><h3>Objectives</h3><div>Prosthetic feet are designed to fulfil the function of the ankle-foot part. It is an important part of lower extremity prostheses. Although there are many different types of prosthetic feet, it is difficult to determine the most suitable prosthetic foot for each amputee.</div><div>The aim of this study was to determine the experiences of patients with unilateral transtibial amputation (TTA) regarding different types of prosthetic feet [non-articulating ankle (NAA), articulating hydraulic ankle (AHA) or microprocessor-controlled foot (MPC)].</div></div><div><h3>Methods</h3><div>Seventeen patients with unilateral traumatic TTA who had experience with all three prosthetic foot types were included. Patients were asked to rate 14 features of the different types of prosthetic feet they had used using a numeric rating scale.</div></div><div><h3>Results</h3><div>There were statistically significant differences between the prosthetic feet in walking on flat roads, walking on uneven roads, walking fast, running, descending and ascending stairs, descending and ascending ramps, using with different shoes, using at home, maintenance need, and general satisfaction (p &lt; 0.001, p &lt; 0.001, p &lt; 0.001, p:0.005, p &lt; 0.001, p &lt; 0.001, p &lt; 0.001, p &lt; 0.001, p &lt; 0.001, p &lt; 0.001, p:0.042, p &lt; 0.001, respectively). No statistically significant difference was found in the frequency of malfunction and weight of prosthetic foot types (p:0.929, p:0.114, respectively).</div></div><div><h3>Conclusions</h3><div>From the patient perspective, MPC was better than AHA and NAA in most activities of daily living and general satisfaction. AHA was better than NAA in these activities. There was no difference in the frequency of malfunction and the weight of the prosthetic foot.</div></div><div><h3>Clinicaltrial</h3><div>Registry name: Comparison of Different Types of Prosthetic Feet; Patient Perspective, Registry number: NCT05691998.</div></div>","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 358-363"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144855656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Association of knee extension deficit and lumbar kyphosis with functional impairments in patients with knee osteoarthritis: The Nagahama study","authors":"Sayaka Okada ,&nbsp;Masashi Taniguchi ,&nbsp;Tome Ikezoe ,&nbsp;Tadao Tsuboyama ,&nbsp;Hiromu Ito ,&nbsp;Shuichi Matsuda ,&nbsp;Fumihiko Matsuda ,&nbsp;Tsukasa Kamitani ,&nbsp;Noriaki Ichihashi","doi":"10.1016/j.jos.2025.07.004","DOIUrl":"10.1016/j.jos.2025.07.004","url":null,"abstract":"<div><h3>Background</h3><div>The knee extension deficit is known to occur with an increase in lumbar kyphosis. This study aimed to determine the association of knee extension deficit and lumbar kyphosis with knee symptoms and functional activities in patients with Knee Osteoarthritis (KOA).</div></div><div><h3>Methods</h3><div>Four hundred forty-eight participants aged 60 or over with radiographic KOA, all local community residents, were included in the analysis. The Knee Scoring System (KSS) was used to assess the functional abilities and symptoms. The knee extension angle was measured using a goniometer, and the lumbar spine angle was measured using Spinal Mouse, which is a noninvasive skin surface device. The associations between KSS symptoms or function scores with the presence or absence of knee extension deficit and lumbar kyphosis was evaluated using the multiple regression analysis. Another multiple regression analysis was conducted to clarify the effect of the coexisting knee extension deficit and lumbar kyphosis on KSS scores.</div></div><div><h3>Results</h3><div>The presence of knee extension deficit (β = −2.67; 95 % confidence interval [95 % CI]: −5.08, −0.27; p = 0.03) and lumbar kyphosis (β = −6.15; 95 % CI: −9.44, −2.86; p &lt; 0.01) were associated with the KSS function score. Furthermore, the coexisting knee extension deficit and lumbar kyphosis significantly decreased the KSS function score (β = −10.24; 95 % CI: −15.1, −5.37; p &lt; 0.01). However, the interaction between knee extension deficit and lumbar kyphosis was not statistically significant (p = 0.25). The KSS symptom score was not associated with knee extension deficit or lumbar kyphosis in either analysis.</div></div><div><h3>Conclusions</h3><div>Our findings indicate that the coexisting knee extension deficit and lumbar kyphosis are an adverse clinical indicator associated with functional impairments in patients with KOA.</div></div><div><h3>Study design</h3><div>Retrospective clinical study.</div></div>","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 406-413"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144812191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prevalence and related factors of early-phase diffuse idiopathic skeletal hyperostosis in a community-dwelling population – A cross-sectional observational study","authors":"Kairo Wada,&nbsp;Kanichiro Wada,&nbsp;Takaaki Nakano,&nbsp;Tetsushi Oyama,&nbsp;Gentaro Kumagai,&nbsp;Yohshiro Nitobe,&nbsp;Kotaro Aburakawa,&nbsp;Noriyuki Chiba,&nbsp;Yasuyuki Ishibashi","doi":"10.1016/j.jos.2025.07.009","DOIUrl":"10.1016/j.jos.2025.07.009","url":null,"abstract":"<div><h3>Background</h3><div>The concept of early-phase diffuse idiopathic skeletal hyperostosis (EDISH) was recently introduced and its prevalence at the thoracic spine level was revealed. Some cases of EDISH progress to diffuse idiopathic skeletal hyperostosis (DISH) in association with being overweight. The prevalence and distribution of EDISH in the whole spine and related factors are unclear. The purpose of this study is to identify the prevalence and ossification patterns of EDISH, termed EDISH, as well as factors associated with the severity of ossification in a community-dwelling Japanese population.</div></div><div><h3>Methods</h3><div>A cohort study based on an observational health check-up project. The study included 524 participants (215 men and 309 women) from a community health checkup in 2021. Each participant underwent lateral whole spine radiography for evaluation of intervertebral ossification and was allocated into one of three groups accordingly: no DISH (NDISH), EDISH, and DISH. We recorded the body composition and laboratory data. Factors associated with ossification were investigated using multivariable regression analysis.</div></div><div><h3>Results</h3><div>The prevalence of EDISH was 5.5 % overall (10.2 % in men and 2.3 % in women). The prevalence of DISH was 7.4 %, and the prevalence was significantly higher in men (P &lt; .001). The center and lower end of ossification were most observed at the lower thoracic level. Age was significantly higher in the EDISH and DISH groups than in the NDISH group. Multivariable analysis revealed that the severity of ossification was associated with the percentage of body fat, insulin-like growth factor-1, adiponectin, and high-density lipoprotein-cholesterol.</div></div><div><h3>Conclusion</h3><div>The overall prevalence of EDISH and DISH was 5.5 % and 7.4 %, respectively, and the prevalence of both conditions was higher in men. Our analysis suggests that the center of ossification was the lower thoracic level, with gradual development. Lipid metabolism may be associated with ossification.</div></div>","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 319-326"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145015695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prevalence and characteristics of femoroacetabular impingement among Japanese patients: A nationwide epidemiological study","authors":"Kensuke Fukushima ,&nbsp;Tetsuya Jinno ,&nbsp;Ryohei Takada ,&nbsp;Takuma Yamasaki ,&nbsp;Hideki Fujii ,&nbsp;Naomi Kobayashi ,&nbsp;Toshikazu Kubo ,&nbsp;Hajime Sugiyama ,&nbsp;Nobuhiko Sugano","doi":"10.1016/j.jos.2025.08.014","DOIUrl":"10.1016/j.jos.2025.08.014","url":null,"abstract":"<div><h3>Background</h3><div>Femoroacetabular impingement (FAI) causes hip pain and osteoarthritis (OA). However, its prevalence and characteristics in the Japanese population remain unclear. Therefore, this large-scale nationwide epidemiological study aimed to determine the current aetiologies of hip disorders in Japan, focusing on the prevalence and clinical features of primary FAI.</div></div><div><h3>Methods</h3><div>A total of 2402 patients presenting with groin pain were prospectively enrolled from 16 hip-specialised institutions across Japan. Diagnoses were based on standardised clinical and radiographic evaluations, including the Japanese Hip Society criteria for primary FAI. Centralised radiographic assessment was also conducted using dedicated measurement software.</div></div><div><h3>Results</h3><div>Secondary OA due to hip dysplasia was the most common diagnosis (52.9 %), followed by primary OA (16.8 %), osteonecrosis of the femoral head (8.5 %), and primary FAI (6.2 %). Patients with FAI were predominantly younger males. Cam-type FAI was the most frequently identified FAI subtype. Centralised radiographic assessment revealed discrepancies compared with institutional diagnoses, in which 12.8 % of patients initially diagnosed with FAI showed signs of advanced OA, the percentage of hips with a lateral center-edge angle &lt;25° was higher in the centralised measurements (13.8 % vs. 6.4 %; <em>P</em> &lt; 0.001), and the percentage of hips with an alpha angle ≥55° was reduced (40.3 % vs. 67.7 %; <em>P</em> = 0.0393).</div></div><div><h3>Conclusion</h3><div>This nationwide study identified secondary OA due to hip dysplasia as the most common (52.9 %), with primary FAI identified in 6.2 % of cases, predominantly affecting younger males with cam-type morphology. Standardised radiographic assessment revealed an underdiagnosis of hip dysplasia and OA and a potential overdiagnosis of cam-type FAI, emphasising the need for accurate diagnosis to guide appropriate treatment decisions.</div></div>","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 420-425"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145075502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Translation, cultural adaptation, validity, and reliability of the Japanese version of the constant score: A cross-sectional study","authors":"Daisuke Uritani ,&nbsp;Yuuka Yasuura ,&nbsp;Kinako Sasaki ,&nbsp;Nobuya Harada ,&nbsp;Christopher R. Constant","doi":"10.1016/j.jos.2025.08.012","DOIUrl":"10.1016/j.jos.2025.08.012","url":null,"abstract":"<div><h3>Background</h3><div>The Constant Score (CS) is one of the most widely used shoulder function assessment instruments. However, a culturally and linguistically adapted Japanese version has not yet been established. This study aimed to translate and culturally adapt CS into Japanese (CS-J) and evaluate its reliability and validity.</div></div><div><h3>Methods</h3><div>The CS was translated into Japanese following internationally accepted cross-cultural adaptation guidelines. Psychometric properties of the CS-J were evaluated in 64 patients with shoulder dysfunction. Internal consistency was assessed using Cronbach's alpha. Test–retest reliability was examined using intraclass correlation coefficients (ICC). Construct validity was confirmed by exploratory factor analysis (EFA), and concurrent validity was tested against SPADI, QuickDASH, and SF-12 scores.</div></div><div><h3>Results</h3><div>The CS-J demonstrated excellent internal consistency (Cronbach's alpha = 0.91) and test–retest reliability (ICC = 0.91). The EFA revealed a two-factor structure corresponding to the subjective and objective components of the CS. Significant correlations were found between CS-J and SPADI (r = −0.82), QuickDASH (r = −0.82), SF-12 Physical Component Summary (r = 0.72), and Mental Component Summary (r = 0.52) scores, supporting concurrent validity.</div></div><div><h3>Conclusions</h3><div>The CS-J has acceptable reliability and validity, making it a useful tool for evaluating shoulder function in Japanese patients. The standardized adaptation of the CS-J enables more accurate clinical assessments and facilitates international research collaboration.</div></div>","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 343-348"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145086408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The evolving role of orthopaedics in Japan: A century of progress and a vision for the future","authors":"Sakae Tanaka","doi":"10.1016/j.jos.2025.10.001","DOIUrl":"10.1016/j.jos.2025.10.001","url":null,"abstract":"","PeriodicalId":16939,"journal":{"name":"Journal of Orthopaedic Science","volume":"31 2","pages":"Pages 275-276"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145635123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}