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Published on: December 20, 2024
Thin hard crest on the edge of ceramic acetabular liners accelerates wear in edge loading
Anthony P Sanders1, Parth J Dudhiya, Rebecca M Brannon
1Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah 84112, USA.
Abstract:
Ceramic acetabular liners may exhibit a small, sharp crest-an artifact of discontinuous machining steps--at the junction between the concave spherical surface and the interior edge. On 3 ceramic liners, this crest was found to form a 9° to 11° deviation from tangency. Edge loading wear tests were conducted directly on this crest and on a smoother region of the edge. The crest elicited 2 to 15 times greater volumetric wear on the femoral head. The propensity of the crest to rapidly (<2000 wear cycles) cause elevated wear under low contact force (200 N) suggests that the crest artifact of prevailing machining protocols might be a root cause of stripe wear and squeaking in ceramic acetabular bearings.
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