Comparison of Standing, Prone, and Sitting Protocols for Knee Joint Position Sense Testing in Non-Athletic Adolescent Females: A Non-Weight-Bearing Open Kinetic Chain Study

Background/Objectives: Knee joint position sense (KJPS) assessment lacks standardized testing protocols, and it remains unclear how commonly used non-weight-bearing protocols—standing, prone, and sitting—and target angle influence reproduction error. This study aimed to compare KJPS error across these three protocols and three target knee-flexion angles (30°, 45°, 60°) in non-athletic adolescent females.