The Role of Articular Surface Design in Neoprosthesis Failure

Polyethylene insert thickness can be variable depending on the manufacturer definition. Thickness of less than 8 mm is associated with catastrophic polyethylene failure. Cause of failure as it relates to kinematics is excessive femoral rollback. Newer prosthesis designs sacrifice rollback and have a more congruent or dished fit between the femoral condyle and the tibial insert in both the sagittal and coronal plane.