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All revision total knee arthroplasties for failure of a metal-backed patellar component during a 4-year period were reviewed. Twenty-five revisions, representing six designs, were performed in 24 patients. The failure mode included wear or fragmentation of the patellar polyethylene in 20 knees, polyethylene separation from the metal baseplate in 3, and metal peg-baseplate fracture in 2. Time to...