Adaptation and psychometric evaluation of the Chinese version of the hip disability and osteoarthritis outcome Score–Physical function Short-form (HOOS-PS)

Chronic hip joint disease has a high prevalence in China, and the primary scale currently used to assess functional recovery after total hip arthroplasty (THA) is the Hip disability and Osteoarthritis Outcome Score - Physical Function Short-form (HOOS-PS). Therefore, our objective was to translate the HOOS-PS scale into Simplified Chinese and evaluate its reliability, validity, and responsiveness in THA patients. First, we followed the widely accepted cross-cultural translation process to translate the original HOOS-PS into the Chinese version of HOOS-PS (CHOOS-PS). Then, we recruited patients with chronic hip joint disease who were scheduled to undergo THA to complete the Western Ontario and McMaster Universities Arthritis Index (WOMAC), the Oxford Hip Score (OHS), Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36) and CHOOS-PS scales. Subsequently, we calculated the standardized response mean (SRM), effect size (ES), Spearman correlation coefficient (rs), standard error of measurement (SEM), intraclass correlation coefficient (ICC), Cronbach’s alpha coefficient, and confirmatory factor analysis (CFA) based on the scale scores. Ultimately, 142, 138, and 109 patients completed the scale assessments at three stages. The results showed that CHOOS-PS has excellent test-retest reliability (ICC = 0.848–0.919) and good internal consistency (Cronbach’s alpha = 0.892). The CHOOS-PS questionnaire demonstrated excellent correlation with the OHS scale (rs = 0.874), good correlation with all three subscales of the WOMAC (rs = 0.638–0.764), moderate to good correlation with the physical dimensions of the SF-36 (rs = 0.424–0.693), and poor to fair correlation with the mental dimensions of the SF-36 (rs = 0.165–0.319). The CFA results showed a good fit (root mean square error of approximation (RMSEA) = 0.050, the comparative fit index (CFI) = 0.995, and the Tucher-Lewis Index (TLI) value = 0.991). These results indicate that the HOOS-PS scale has good construct validity. Additionally, CHOOS-PS showed good responsiveness (ES = 1.93, SRM = 1.88). The CHOOS-PS scale is a reliable tool for evaluating the functional outcomes of Chinese patients with chronic hip joint disease after THA.