Psychometric properties of the Arabic version of the International Knee Documentation Committee subjective knee form

<b>Background: </b>The International Knee Documentation Committee (IKDC) subjective knee form is a widely used measure to assess symptoms, functional impairments, and sport activity limitations related to knee conditions.<br /> <b>Objectives: </b>This study aimed to assess the psychometric properties of the Arabic version of the IKDC (IKDC-AR) in patients experiencing knee pain.<br /> <b>Methods:</b> The IKDC-AR was compared to the short form 36 (SF-36) questionnaire, and the visual analog scale (VAS) using Spearman’s rank correlation coefficient to evaluate construct validity. Internal consistency was examined using Cronbach’s alpha, while test-retest reliability was analyzed using intraclass correlation coefficient (ICC<sub>2,1</sub>). Measurement precision was quantified through the standard error of measurement (SEM) and minimal detectable change (MDC).<br /> <b>Results: </b>Strong correlations were observed between the IKDC-AR and SF-36 subscales reflecting similar constructs, including physical component summary and physical function (r = 0.71 and r =0.74, respectively). A moderate negative correlation with the VAS (r = -0.65) further supported construct validity. Divergent validity was confirmed by weak correlations with SF-36 subscales for the mental component summary and mental health (r =0.17 and r =0.18, respectively). The IKDC-AR demonstrated excellent internal consistency (Cronbach’s alpha = 0.92) and high test-retest reliability (ICC<sub>2,1 </sub>= 0.95). Measurement precisions was highlighted with a SEM of 3.95 and MDC of 10.95.<br /> <b>Conclusion: </b>The IKDC-AR is a reliable and valid tool for evaluating knee function and symptoms in Arabic-speaking patients with knee pain. Its strong psychometric properties make it suitable for both clinical and research applications.