Kinematic analysis of mobile-bearing total knee arthroplasty using a 6-DOF knee simulator

Despite the mobility of the insert in the mobile-bearing total knee arthroplasty, the motion of the insert was decreased during dynamic conditions because of the disruption of full contact between the femoral component and the polyethylene insert. Differences in the rotation between the mobile-bearing knee and the low contact stress rotating-platform design were due to the fixed axis of the internal-external rotation in the low contact stress rotating-platform design. The theoretical advantages for the mobile-bearing design over the fixed-bearing design were not demonstrated in this study.