Thin hard crest on the edge of ceramic acetabular liners accelerates wear in edge loading.
Thin hard crest on the edge of ceramic acetabular liners accelerates wear in edge loading.
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陶瓷髋臼衬垫边缘的薄硬嵴会加速边缘负载的磨损。
DOI：
10.1016/j.arth.2011.08.012
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Brannon,RebeccaM
中科院分区：
文献类型：
--
作者：
Sanders,AnthonyP;Dudhiya,ParthJ;Brannon,RebeccaM
陶瓷髋臼衬里可能会在凹面球面和内缘的交界处出现一个小而尖锐的波峰--这是不连续加工步骤的产物。在3个陶瓷衬里上，发现该牙冠偏离切线9°~11°。边缘载荷磨损试验直接在该波峰上进行，并在边缘较光滑的区域进行。冠状突起对股骨头的体积磨损量增加了2到15倍。在低接触力(200N)下，波峰容易迅速(<；2000个磨损周期)导致磨损升高，这表明主流加工方案中的波峰伪影可能是陶瓷髋臼轴承条纹磨损和吱吱作响的根本原因。
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.