Differences in articular track area of posterior-stabilized and cruciate-retaining retrieved total knee implants
Bradley, M.P.; Mayor, M.B.; Collier, J.P.
Orthopedics 27(12): 1273-1278
2004
ISSN/ISBN: 0147-7447 PMID: 15633958 Document Number: 568160
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.