Validity and Reliability of the Turkish Version of Western Ontario Osteoarthritis of the Shoulder Index

OBJECTIVES: This study aims to adapt the Western Ontario Osteoarthritis of the Shoulder (WOOS) index specific to shoulder osteoarthritis into Turkish and to evaluate its validity and reliability. PATIENTS AND METHODS: The WOOS index was translated and culturally adapted into Turkish, systematically. It was applied to a total of 68 patients (17 males, 51 females; mean age: 61.5±8.7 years; range, 45 to 80 years) with osteoarthritis of the shoulder treated conservatively. The reliability of the scale was checked through internal consistency and test-retest methods. Internal consistency was analyzed with Cronbach alpha value. Test-retest reliability was assessed using an intraclass correlation coefficient (ICC) with 25 patients. The Western Ontario Rotator Cuff (WORC), the Shoulder Pain and Disability Index (SPADI), and the Society of American Shoulder and Elbow Surgeons Standardized Shoulder Assessment (ASES) scores were used to conduct concurrent validity. RESULTS: The Cronbach alpha value of the scale was found to be excellent as 0.92 (p<0.001). The ICC value was also excellent as 0.97 (p<0.001). There was an excellent positive correlation with WORC (0.847; p<0.001) and a very good positive correlation with SPADI (0.788; p<0.001). It was also negatively very good to correlate with the ASES (-0.754; p<0.001). Additionally, subsections of WOOS had a good correlation with the corresponding subsections of WORC (0.779-0.664; p<0.001). CONCLUSION: The Turkish version of the WOOS index is a valid and reliable tool and is recommended for use in the assessment of patients with osteoarthritis of the shoulder.