Publication: Thin Hard Crest on the Edge of Ceramic Acetabular Liners Accelerates Wear in Edge Loading.

Sanders, A. P., P. J. Dudhiya, and R. M. Brannon. (2012). “Thin Hard Crest on the Edge of Ceramic Acetabular Liners Accelerates Wear in Edge Loading.” Journal of Arthroplasty 27(1): 150-152.

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.

Available online:

doi:10.1016/j.arth.2011.08.012.