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The Effect of 3D Thigh-Calf Contact on External Knee Forces and Moments in Six High Knee Flexion Movements

Conference: 20th Biennial Meeting of the Canadian Society for Biomechanics (CSB)
Abstract: When performing high knee flexion movements (>120º), thigh-calf (TC) and heel-gluteal (HG) structures come into contact and transmit force between segments. Previous work has only assessed the effect of these forces on net external knee joint forces and moments in the sagittal plane. Therefore, the purpose of this study was to quantify the effect of incorporating the 3D location and orientation of TC and HG force vectors on external forces and moments acting on the knee. Sixteen participants (8 M/F) completed five repetitions of six high-flexion movements. Kinematics, kinetics, and pressure distribution (of TC and HG contact) were measured from the right lower limb. Inverse dynamics were calculated with and without TC and HG force, to determine the change in magnitude. During high knee flexion movements, there was a significant reduction in AP forces (~50%) and F/E moments (~27%) as a result of considering contact between lower limb segments. Novel to this study was the ability to account for the 3D force vector and CoF location of TC and HG by tracking the motion of the pressure mat allowing the effect on frontal plane moments to be determined. There was a significant increase in the Ab/Ad moment (~60% in two movements) which is a known risk factor for knee osteoarthritis development. These results will improve the biofidelity of future high flexion musculoskeletal models of the knee. Future work is required to determine if findings from this young and healthy population translates to occupational or individuals that habitually kneel.
Listed In: Biomechanics,
Tagged In: 3D Kinetics, High Knee Flexion, Thigh-Calf Contact

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