Self-Reported and Performance-Based Functions Differ for People With Tibiofemoral and Patellofemoral Osteoarthritis.

TFJ OA exhibits a striking paradox of greater perceived disability despite objectively better performance on the OARSI minimum core set. These findings highlight the limitation of relying on single assessment methods. A comprehensive assessment approach incorporating both self-reported and performance-based measures is recommended. Additionally, adopting an integrated compartment-specific evaluation framework is strongly advocated to facilitate precise clinical interpretation and optimise rehabilitation planning.