This paper deals with nonlinear dynamics of viscoelastic ligament model human knee. A two dimensional model of the human knee to include tibia and femur, and the ligamentous structure between the two bones is used to investigate the influence of ligamentous viscoelastic properties on dynamic testing of human knee. An exercise in which the femur is pinned at the hip in a sitting position, and tibia in a vertical position is actuated by a vertical harmonic force at various frequencies is proposed. The viscoelastic model of ligaments shows for the knee dynamic testing a resonance in the range of 15 Hz to 20 Hz.

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