Knee joint biomechanics in closed-kinetic-chain exercises

Abstract

Effective management of knee joint disorders demands appropriate rehabilitation programs to restore function while strengthening muscles. Excessive stresses in cartilage/menisci and forces in ligaments should be avoided to not exacerbate joint condition after an injury or reconstruction. Using a validated 3D nonlinear finite element model, detailed biomechanics of the entire joint in closed-kinetic-chain squat exercises are investigated at different flexion angles, weights in hands, femur-tibia orientations and coactivity in hamstrings. Predictions are in agreement with results of earlier studies. Estimation of small forces in cruciate ligaments advocates the use of squat exercises at all joint angles and external loads. In contrast, large contact stresses, especially at the patellofemoral joint, that approach cartilage failure threshold in compression suggest avoiding squatting at greater flexion angles, joint moments and weights in hands. Current results are helpful in comprehensive evaluation and design of effective exercise therapies and trainings with minimal risk to various components.

Keywords:

• closed-kinetic-chain squat exercises
• knee joint
• finite elements
• quadriceps
• hamstrings
• biomechanics

Acknowledgements

The financial support of the Natural Science and Engineering Research Council of Canada (NSERC-Canada) and University Mission of Tunisia in North America (MUTAN) are gratefully acknowledged. The earlier efforts of M.Z. Bendjaballah and K.E. Moglo and W. Mesfar in development of the model are also acknowledged.