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Estimation of Tibiofemoral Joint Contact Forces Using Foot Loads during Continuous Passive Motions
Yunlong Yang1, Huixuan Huang2, Junlong Guo3
1State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China.
Sensors (Basel, Switzerland)
|July 9, 2022
Summary
Continuous passive motion (CPM) machines impact tibiofemoral forces (TFFs) differently during knee flexion versus extension. Body weight significantly influences TFFs, aiding in optimizing rehabilitation device design.
Area of Science:
- Biomechanics
- Orthopedic Surgery
- Rehabilitation Engineering
Background:
- Continuous passive motion (CPM) is widely used post-knee surgery.
- Limited data exists on tibiofemoral forces (TFFs) during CPM.
- Understanding TFFs is crucial for optimizing rehabilitation.
Purpose of the Study:
- To investigate TFFs during CPM cycles.
- To analyze the effects of range of motion (ROM) and body weight (BW) on TFFs.
- To develop a mathematical model for TFF estimation.
Main Methods:
- A 2D mathematical model was established.
- TFFs were calculated using joint angles, foot load, and leg-foot weight.
- Eleven healthy males underwent testing with varying ROM (0°-120°).
Main Results:
- Peak TFFs were higher during knee flexion than extension.
- TFFs varied nonlinearly with ROM.
- BW significantly affected peak TFFs and shear forces; ROM had a limited effect.
- A strong linear correlation was found between peak tibiofemoral compressive forces and peak resultant TFFs (R2 = 0.971).
Conclusions:
- CPM affects TFFs nonlinearly with ROM and BW.
- The developed model can estimate TFFs during CPM.
- This method can inform the optimization of CPM rehabilitation devices.
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