Posterior Stabilized Total Knee Replacement

PS Total Knee is slightly more constrained prosthesis that requires removal of both ACL & PCL.
Resection of PCL increases the flexion gap in relationship to extension gap so posterior must be matched to avoid flexion-extension mismatch.
Femoral component contains a CAM that engages the tibial polyethylene Post during flexion.
Polyethylene inserts are more congruent, or deeply "dished"