Persian version of Animated Activity Questionnaire: assessment of reliability, validity, and responsiveness in individuals with knee osteoarthritis.

PURPOSE: This study evaluated the reliability, validity, and responsiveness of the Persian version of the Animated Activity Questionnaire (P-AAQ) among individuals with knee osteoarthritis (KOA). METHOD: To assess reliability, a subset of participants completed the P-AAQ twice. Internal consistency was evaluated using Cronbach's alpha. Convergent validity was assessed by comparing P-AAQ scores with the Physical Component Summary of the 12-Item Short Form Survey (SF-12 PCS), the Activities of Daily Living subscale of the Knee injury and Osteoarthritis Outcome Score- (KOOS-ADL), the Timed Up and Go (TUG) test, and the Stair Climbing Test (SCT). Discriminant validity was evaluated by comparing KOA individuals to a control group. Responsiveness was measured after one month of orthotic intervention. RESULTS: The P-AAQ demonstrated excellent test-retest reliability (ICC2,1 = 0.99) and internal consistency (Cronbach's alpha = 0.90). Strong correlations were found between P-AAQ and KOOS-ADL (r = 0.78) and SF-12 PCS (r = 0.79). The P-AAQ effectively differentiated between KOA and healthy individuals (p < 0.001), except for the "Taking off shoe" item. After four weeks of orthotic intervention, pain scores decreased (p < 0.001), while P-AAQ scores increased (p < 0.001), suggesting that P-AAQ was responsive to change. CONCLUSION: The P-AAQ effectively assesses activity limitations in individuals with KOA, demonstrating strong validity, reliability, and responsiveness.