Validity and reliability of the Western Ontario Rotator Cuff Index (WORC) for use in Brazil

Validity and reliability of the Western Ontario Rotator Cuff Index (WORC) for use in Brazil

Author Lopes, Andrea Diniz Autor UNIFESP Google Scholar
Ciconelli, Rozana Mesquita Autor UNIFESP Google Scholar
Carrera, Eduardo F. Autor UNIFESP Google Scholar
Griffin, Sharon Google Scholar
Faloppa, Flávio Autor UNIFESP Google Scholar
Reis, Fernando Baldy dos Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Univ Western Ontario
Abstract Objective: To evaluate the validity and reliability of the Brazilian Portuguese version of the Western Ontario Rotator Cuff Index (WORC).Design and Setting: A cross-sectional survey at the Physiotherapy Unit and Outpatient Orthopedic and Traumatology Clinic, Universidade Federal de Sao Paulo.Methods: To test validity, 100 patients with rotator cuff disorders were evaluated using the WORC, clinically relevant outcomes for patients with shoulder disorders (pain, range of motion, and strength), and the Disabilities of Arm, Shoulder, and Hand (DASH), University of California Los Angeles Shoulder Rating Scale (UCLA), and Short Form-36 (SF-36) self-report measures. The WORC was repeated on 50 patients on the same day (more than I hour later) and after a mean interval of 7 days to evaluate the test-retest reliability. Concurrent validity was tested by correlating the WORC to the other outcome measures using Pearson's correlation coefficient. Test-retest reliability and internal consistency were determined by the intraclass correlation coefficient and Cronbach's alpha coefficient, respectively. The scores were used to assess the standard error measurement (SEM) and minimal detectable change (MDC).Results: Analysis between the WORC and clinically relevant outcomes for patients with shoulder disorders revealed weak to strong correlations; the weakest for active internal rotation (r = -0.22) and the strongest for pain during movement (r = -0.75). Strong correlations were found among the WORC and the DASH and UCLA (r = -0.86 and r = 0.80, respectively). There were moderate correlations between the WORC and SF-36 domains (0.37 to 0.69); the best correlations related to the physical domains. Reliability analysis revealed excellent results, with the intraclass correlation coefficient ranging from 0.95 to 0.99 and Cronbach's alpha ranging from 0.88 to 0.97. The SEM was 5.2 and 3.0 for time 0 and after a mean interval of 7 days, respectively. The MDC was 7.1 over this mean time interval (90% confidence interval).Conclusions: The Brazilian version of the WORC proved to be a valid and reliable measurement tool for assessing health-related quality of life in patients with rotator cuff diseases.
Keywords rotator cuff
quality of life
validation studies
Language English
Date 2008-05-01
Published in Clinical Journal Of Sport Medicine. Philadelphia: Lippincott Williams & Wilkins, v. 18, n. 3, p. 266-272, 2008.
ISSN 1050-642X (Sherpa/Romeo, impact factor)
Publisher Lippincott Williams & Wilkins
Extent 266-272
Access rights Closed access
Type Article
Web of Science ID WOS:000255706800008

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