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This is thought to be caused by the stiffness mismatch between the implant and cartilage\u2010bone construct. Reducing the stiffness of the implant by changing the material has been hypothesized as a potential solution. This study employs a finite element model to study a concave\u2010convex hemiarthroplasty articulation for various implant materials (cobalt\u2010chrome, pyrolytic carbon, polyether ether ketone, ultra\u2010high\u2010molecular\u2010weight polyethylene, Bionate\u201055D, Bionate\u201075D, and Bionate\u201080A). The effect of the radius of curvature and the degree of flexion\u2010extension was also investigated to ensure any relationships found between materials were\u00a0generalizable. The implant material had a significant effect (<jats:italic>P\u2009\u2009<\/jats:italic>&lt;\u2009.001) for both contact area and maximum contact pressure on the cartilage surface. All of the materials were different from the native state except for Bionate\u201080A at two of the different flexion angles. Bionate\u201080A and Bionate\u201075D, the materials with the lowest stiffnesses, were the closest to the native state for all flexion angles and radii of curvature. No evident difference between materials occurred unless the modulus was below that of Bionate\u201055D (288\u2009MPa), suggesting that hemiarthroplasty materials need to be less stiff than this material if they are to protect the opposing cartilage. This is clinically significant as the findings suggest that the development of new hemiarthroplasty implants should use materials with stiffnesses much lower than currently available devices.<\/jats:p>","DOI":"10.1002\/jor.24610","type":"journal-article","created":{"date-parts":[[2020,2,4]],"date-time":"2020-02-04T07:28:38Z","timestamp":1580801318000},"page":"1719-1726","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Hemiarthroplasty implants should have very low stiffness to optimize cartilage contact stress"],"prefix":"10.1002","volume":"38","author":[{"given":"Carolyn","family":"Berkmortel","sequence":"first","affiliation":[{"name":"Department of Mechanical and Materials Engineering Western University London Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G. 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