Cross-Cultural Adaptation and Measurement Properties of Korean Version of Western Ontario Shoulder Instability Index

초록

Background : Western Ontario Shoulder Instability Index (WOSI) is a disease specific questionnaire to measure quality of life with regards to shoulder instability. This study aimed to enable cross-cultural adaptation of Western Ontario Shoulder Instability Index into Korean and investigate its reliability and validity. Methods : Translation was completed in accordance with the translation and backward translation guideline that development team recommend. The Korean WOSI (K-WOSI) and Korean Quick Disabilities of the Arm, Shoulder and Hand for Koreans (K-QuickDASH) were answered by subjects for reliability and validity test. K-WOSI was filled out again after the first evaluation after mean 2 days. In addition, floor and ceiling effects were evaluated. Results : Total 16 patients waiting for shoulder stabilizing surgery recruited. Internal consistency was high (Cronbach‘s alpha = 0.97 for total score of K-WOSI). Test-retest reliability measured by Pearson’s r and Intraclass Correlation Coefficient for total score were 0.86 and 0.92 respectively, confirming excellent reliability. And total scores of K-WOSI and K-QuickDASH showed high correlation (Pearson’s r = 0.88). Also, there were no floor and ceiling effects observed in the K-WOSI. Conclusions : The study findings confirmed that K-WOSI is a reliable and valid tool that assesses patients‘ quality of life with shoulder instability.

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