Posterior stabilization in total knee arthroplasty with use of an ultracongruent polyethylene insert

Fifty-three primary and 47 revision posterior cruciate ligament (PCL)-subst ituting total knee arthroplasties (TKAs) using a highly conforming (ultraco ngruent) polyethylene insert were retrospectively reviewed over a 48- to 10 6-month (mean, 60 +/- 11 months) follow-up period. These 100 knees were age and sex matched with another 100 TKAs performed using a PCL-sparing design . The ultracongruent design has an anterior buildup of 12.5 mm and a more c onforming articular surface to match better the radius of the femoral compo nent. In primary and revision TKAs, the average Hospital for Special Surger y knee score (P = .3) and range of motion (P = .43) were similar between th e PCL-sparing and ultracongruent groups. Ln primary and revision TKAs, ther e were no revisions resulting from instability for patients receiving an ul tracongruent insert versus 5 knees in the PCL-sparing control group seconda ry to subsequent postoperative anteroposterior instability and PCL insuffic iency.