psychometric properties of full and shortened persian-version of western ontario rotator cuff index questionnaires in persian-speaking patients with shoulder pain

Background: this study aimed to translate the shortened western ontario rotator cuff (short-worc) questionnaire into persian and determine the psychometric features of worc and persian-short-worc in patients with shoulder pain.methods: a total of 130 patients completed persian-worc and -short-worc, shoulder pain and disability index (spadi), shortened disability of arm, shoulder, and hand (quick-dash), worc, as well as short-form health survey (sf-36), in the evaluation and re-evaluation sessions with an interval of 5-7 days to assess reliability and validity. to determine responsiveness, all patients completed questionnaires and a global rating of change scale before and after the 4-week physiotherapy. intra-class correlation coefficient (icc) was used for assessing reliability, two-tailed pearson (r) forvalidity, as well as longitudinal validity, and receiver operating characteristics (roc) curve analysis for responsiveness.results: the icc was 0.95 (confidence interval: 0.93-0.96) for short-worc. a strong correlation was found between short-worc, spadi (r=-0.82), quick-dash (r=-0.79), worc (r=0.92), sf-36 physical (r=0.76), and sf-36 mental (r=0.71). floor and ceiling effects were not detected. the responsiveness of short-worc and worc was proven with an area under the curve of >0.90, and their minimal important change was 28.56 and 26.28 points, respectively.conclusion: the persian version of worc has good psychometric properties to measure disability and health-related quality of life in patients with shoulder pain. level of evidence: iv