Abstract
Total hip arthroplasty (THA) bearings were fabricated from silicon nitride (Si 3N 4) powder. Mechanical testing showed that Si 3N 4 had improved fracture toughness and fracture strength over modern alumina (Al 2O 3) ceramic. When tested with Si 3N 4 cups in a hip simulator, both cobalt-chromium (CoCr) and Si 3N 4 femoral heads produced low wear rates that were comparable to Al 2O 3-Al 2O 3 bearings in THA. This study offers experimental support for a novel metal-ceramic THA bearing couple that combines the reliability of CoCr femoral heads with the wear advantages of ceramic surfaces.
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