Injury prevention

Document Type



The conventional gait model has been used in the analysis of change of direction tasks to identify biomechanical risk factors for anterior cruciate ligament (ACL) injury. Several kinematic and kinetic variables have been associated with increased ACL loading during change of direction. Kinematic and kinetic variable calculations are affected by marker placement. The aim of this study was to determine the sensitivity of joint kinematics and kinetics to marker placement error during a change of direction task. Displacements were applied to the lateral thigh, lateral femoral epicondyle and lateral tibia markers. Statistical parametric mapping was used to examine the effect of these displacements across stance phase. Errors in marker placement within the reported inter-tester variability resulted in significant differences in several kinematic and kinetic variables across large periods of stance phase.