Failure of a Polyaryletheretherketone-Cobalt-Chromium Composite Femoral Stem Due to Coating Separation and Subsidence: A Case Report

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A 52-year-old man who previously had undergone total hip arthroplasty with use of an Epoch (Zimmer) extensively porous-coated femoral stem presented with hip pain after a high-energy motor-vehicle accident. Radiographs demonstrated delamination at the polyaryletheretherketone-cobalt-chromium (PEEK-CoCr) core interface, which led to loosening. At revision, the implant demonstrated gross evidence of debonding at the PEEK-CoCr interface.


We demonstrate clinical and tribologic evidence of a rare failure mode involving the PEEK-metal interface in a composite femoral stem, which surgeons should be aware of when evaluating patients with this type of implant.

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