Mechanical factors play an important role in the etiology of knee injuries and diseases such as osteoarthritis (OA). While performing daily, occupational, and sport activities, the joint is subjected to dynamic loads such as vibration and multiple impacts. According to an individual’s age, fitness, and weight, these activities may cause the joint load, stiffness, and damping to reach critical limits initiating or accelerating different knee disorders such as osteoarthritis [Wolfe et al., 1996]. Computational models of the knee have been developed over the past several decades. However, these models leave much to be desired, since they often over-simplify the geometry and material properties of the knee. Several two dimensional models have been created [Gill et al., 1996]. Three-dimensional analytical studies have become more common in recent years, and typically model the tibiofemoral joint [Abdel-Rahman et al., 1993; Blankevoort et al, 1991; Wisman et al., 1980]. These studies typically model only surfaces and neglect the effect of ligaments and menisci/cartilage.

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