Hi
I am a PhD student in biomechanics and I have a question regarding the plug-in gait biomechanical model in the Nexus software.
I see significant internal rotation in the knee joint on static testing of Knee OA patients. How can I fix this problem?
Muslim Khan
Measurement Error: Joint kinematics measurements, including knee rotation, can be prone to errors, especially in the z-axis (rotation axis). This measurement error can lead to unexpected results in the static test[1]. Biomechanical Variability: Normal gait involves complex rotational motions of the knee, including internal and external rotation. Variations in individual biomechanics can lead to differences in knee rotation angles, even in static tests[2]. Calibration Methods: The choice of functional calibration methods can affect gait analysis outcomes. Some calibration methods may not accurately account for knee rotation, leading to discrepancies in the results[3]. Model Specifications: Plug-in gait models rely on specific marker placements and models for joint angle calculations. Variations in marker placement or model assumptions can impact knee rotation measurements[[4] Instrumentation: The choice of instrumentation, such as inertial measurement units (IMUs), can affect the accuracy of knee rotation measurements. IMU-based algorithms should be carefully calibrated for accurate results[5}
The unreasonable internal rotation of the knee in a static test of a plug-in gait model in a motion lab may be due to various factors:
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