With the continuing need to evaluate prosthetic wear and kinematics of the knee joint, a number of in vitro dynamic test machines, termed knee simulators, have been built. The objective of this work was to develop a model to predict the tibio-femoral and patello-femoral forces generated for a variety of different knee simulator designs and loading configurations. Moving contact areas determined from experimental kinematics were used to determine moment arms for the forces about the knee. The model was validated using data experimentally obtained using the Purdue Knee Simulator.

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