Computational knee models of mobile bearing implants predict differences in kinematics during simulated squat and lunge deep knee bending activities

Abstract:

The purpose of this paper was to compare the kinematics of a PFC Sigma® rotating platform posterior cruciate-retaining total knee (DePuy, Warsaw, IN), using computational models of two different simulated weight-bearing functional activities. A multibody dynamics program (LifeMOD/KneeSIM, Biomechanics Research Group, Inc., San Clemente, CA) was used to simulate a lunge, similar to that carried out in kinematic studies using fluoroscopy, and a squat under constant body weight. The model included tibio-femoral and patello-femoral contact, passive soft tissue, and active muscle elements.

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