Psychometric properties of the Thai version of the Simple Knee Value in patients with patellofemoral pain.

Abstract

This study aimed to translate the Simple Knee Value (SKV) into Thai and evaluate its psychometric properties as a single-question assessment tool. The SKV was translated into Thai according to international guidelines. Psychometric properties were assessed in adults aged 18-50 years with patellofemoral pain. Participants completed questionnaires at baseline, 2 weeks, and 2 months. Seventy-six patients with patellofemoral pain (mean age 36.8 ± 8.3 years, 56.6% female) participated in this prospective cohort study. SKV scores were moderately correlated with those of the Knee Injury and Osteoarthritis Outcome Score-Patellofemoral Subscale (KOOS-PF) and the Anterior Knee Pain Scale (AKPS). The test-retest reliability was high, with an intraclass correlation coefficient of 0.79 (95% confidence interval: 0.65-0.88). The SKV change scores effectively differentiated between improved and unimproved patients, with a minimal important change of 12.5 points. The SKV demonstrated acceptable psychometric properties for assessing patellofemoral pain in young to middle-aged adults. This single-question patient-reported outcome measure is simple and easy to use in daily clinical practice and can serve as an adjunctive assessment tool in patellofemoral pain research.