The human knee is capable of flexing up to 160°, yet most patients do not achieve more than 120° after total knee arthroplasty (TKA). The translation of the tibiofemoral contact points with flexion is important in the overall understanding of knee kinematics and knee stability, particularly in high flexion. In this study, cadaveric knees were used in conjunction with a robotic testing system and TekScan® film to quantify the tibiofemoral contact between 0°–150° for two TKA designs. We found that, for both TKAs, with increasing knee flexion, the peak contact point moved posteriorly and that the contact area decreased with increasing knee flexion.

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