Fig. 6A–D.

(A) A fracture of the polyethylene occurred 8 years after implantation in the patient shown. The polyethylene was not revised until 6 months after the fracture occurred at which point concomitant revision of the tibial component was necessary as a result of the development of osteolysis. (B) On the lateral radiograph, the metal insert embedded in the polyethylene is visible behind the tibial base plate, confirming the fracture. At revision, a stemmed tibial component was implanted and the osteolysis was grafted as seen on (C) AP and (D) lateral radiographs.