• Jean-Sébastien Roy, Joy C MacDermid, Benjamin C Amick, Harry S Shannon, Robert McMurtry, James H Roth, Ruby Grewal, Kenneth Tang, and Dorcas Beaton.
• Department of Rehabilitation, Faculty of Medicine, Laval University, Quebec City, Quebec, Canada. jeansebastien.roy@rea.ulaval.ca
• Phys Ther. 2011 Feb 1;91(2):254-66.

BackgroundThe Work Limitations Questionnaire-25 (WLQ-25) and the Work Instability Scale for Rheumatoid Arthritis (RA-WIS) have been used to measure at-work disability related to musculoskeletal disorders. However, a recent systematic review has shown that important psychometric properties still needed to be evaluated.ObjectiveThe purpose of this study was to establish the validity and responsiveness of the WLQ-25 and RA-WIS in people with chronic work-related upper-extremity disorders.DesignTwo-hundred six participants with chronic upper-extremity disorders who attended a specialty clinic operated by the Workplace Safety & Insurance Board of Ontario were evaluated at their initial visit and 6 months later.MethodsQuestionnaires completed at each evaluation were: the WLQ-25, the RA-WIS, the QuickDASH, the pain subscale of the Shoulder Pain and Disability Questionnaire, and the Chronic Pain Grade Questionnaire. At the 6-month evaluation, participants completed a global rating of change question. Known-group and construct convergent validity were assessed using analysis of variance and Pearson correlations, and standardized response means (SRMs) were used to assess responsiveness. Clinically important differences (CIDs) also were determined.ResultsThe WLQ-25 and RA-WIS had low to moderate correlations with pain and disability scales (.28LimitationsThe external criterion of change was specific to change in upper-extremity condition and not to change in work ability or productivity.ConclusionsThe WLQ-25 and RA-WIS provide different information from that provided by pain and disability measures. They discriminate among functional outcome subgroups and detect improvement over time in people with chronic work-related upper-extremity disorders.

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