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In the present study, total hip bearings were made from a different ceramic material, silicon nitride (Si<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub>), by sintering and hot isostatic pressing of powders. The resulting material had improved mechanical properties over modern Al<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> THA bearings, with a flexural strength of 920 \u00b1 70 MPa, a Weibull modulus of 19, and a fracture toughness of 10 \u00b1 1 MPa m<jats:sup>1\/2<\/jats:sup>. Unlike zirconia\u2010based ceramics that have also been used in THA, accelerated aging of Si<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub> did not adversely affect the flexural strength. In simulated wear tests, Si<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub> acetabular cups produced low\u2010volumetric wear whether articulating against Si<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub> or cobalt\u2010chromium (CoCr) femoral heads. The results of this investigation suggest that Si<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub> may allow improved THA bearings that combine the reliability of metal femoral heads with the low wear advantages of ceramic materials. \u00a9 2008 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2008<\/jats:p>","DOI":"10.1002\/jbm.b.31123","type":"journal-article","created":{"date-parts":[[2008,5,19]],"date-time":"2008-05-19T22:19:07Z","timestamp":1211235547000},"page":"447-454","source":"Crossref","is-referenced-by-count":69,"title":["Testing of silicon nitride ceramic bearings for total hip arthroplasty"],"prefix":"10.1002","volume":"87B","author":[{"given":"B. 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