Differences in articular track area of posterior-stabilized and cruciate-retaining retrieved total knee implants

Press-fit condylar total knee arthroplasties removed at revision surgery from 27 knees were examined. Fourteen of the implants: were posterior stabilized press-fit condylar systems and 13 were cruciate-retaining press-fit condylar systems. The articular track areas were examined using a digital; camera and manual measurements. Findings revealed the track area in posterior-stabilized implants (93%) was larger than in cruciate-retaining implants (59%). Mean posterior distance ratio of the articular track from the posterior limit of the polyethylene was 2% (.08.cm) for posterior-stabilized implants versus 23% (:97 cm) for cruciate-retaining implants: No differences in wear rating were noted. The pattern of. articular contact in cruciate-retaining knees demonstrated little migration of the femoral contact surface across the tibial polyethylene plateau.