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Background: The Western Ontario Rotator Cuff Index (WORC) is a disease-specific shoulder questionnaire, originally developed at the University of Western Ontario, to measure quality of life in patients with rotator cuff disease (RCD). The aim of the present study was to cross-culturally adapt the WORC for use in the Netherlands and to evaluate the reproducibility in patients with RCD. Materials and methods: The WORC was translated into Dutch according to leading guidelines in the literature, and 52 patients with RCD completed the questionnaire twice within 2 weeks. The Cronbachs α and the intraclass correlation coefficient (ICC) were calculated, Bland-Altman analysis was applied, and the smallest detectable change (SDC) and reliable change index (RCI) were determined. Results: The Cronbachs α ranged from 0.91 to 0.97 for the total WORC score and for the 5 domains. High ICCs were found for the WORC total score (0.94) and for the separate domains (range, 0.85-0.91). Bland-Altman analyses showed no systematic differences between assessments. SDC was 355.7 for the total WORC score, varying from 80.4 to 148.0 for the domains, resulting in RCIs of 16.9% for the total WORC score and 24.7% to 30.2% for the domains. Conclusions: The results of the present study suggest good reproducibility of the Dutch version of the WORC in Dutch-speaking patients with RCD. Additional research on the validation of the Dutch version of the WORC is required in the near future. [ABSTRACT FROM AUTHOR]

Background: The Western Ontario Shoulder Instability Index (WOSI) is a disease-specific shoulder questionnaire to measure quality of life in patients with shoulder instability. The aim of the present study was to translate the WOSI into Dutch and assess its principal measurement properties., Methods: The WOSI was translated into Dutch according to guidelines in the literature. Fifty-two shoulder instability patients completed the questionnaire twice within 2 weeks. We assessed internal consistency (Cronbach's alpha), test-retest reliability [Intraclass Correlation Coefficient (ICC)], standard error of measurement (SEM), smallest detectable change (SDC) and reliable change index. The Bland-Altman analysis was applied to assess test-retest agreement and floor and ceiling effects were calculated., Results: Cronbach's alpha was 0.95 for the total WOSI score (range 0.88-0.95 for the 4 domains). ICC for the total WOSI score was 0.91 (range 0.79-0.90 for domains), SEM was 130.6 for the total WOSI score resulting in a SDC of 362.0, which is 17.3 % of the maximum obtainable score of 2100. Bland-Altman analysis showed no systematic differences or consistent bias between the two assessments. We observed no relevant floor and ceiling effects., Conclusion: The results of the present study suggest the Dutch version of the WOSI is a reliable tool for clinical assessment and scientific evaluation. It shows high values for Cronbach's alpha and ICC implying excellent internal consistency and good test-retest reliability.