From December 1991 to April 1995, 70 consecutive New Jersey low-contact stress (LCS) total knee arthroplasties (TKAs) were performed. Twenty two TKAs were done using rotating platform tibial component, and 48 were done using meniscal bearing tibial component. Two patients sustained bearing insert failure at eight years after primary TKA. Subluxation of tibiofemoral articulation occurred in one case, secondary to increased polyethylene wear and ligamentous instability. It was corrected easily by the insertion of a thicker bearing. The other case had patellar bearing breakage with delamination, but patellofemoral maltracking was not seen. The polyethylene of the patellar component was changed, improving the condition of both patients with relief of pain. Component failure, especially polyethylene wear and breakage were found to occur frequently.
