Concomitant evolution of wear and squeaking in dual-severity, lubricated wear testing of ceramic-on-ceramic hip prostheses.
Concomitant evolution of wear and squeaking in dual-severity, lubricated wear testing of ceramic-on-ceramic hip prostheses.
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陶瓷对陶瓷髋关节假体的双重严重性、润滑磨损测试中磨损和吱吱声的伴随演变。
DOI：
10.1002/jor.22080
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Brannon,Rebecca
中科院分区：
文献类型：
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作者：
Sanders,Anthony;Tibbitts,Ira;Brannon,Rebecca
陶瓷对陶瓷（CoC）髋关节衬垫在短期磨损试验中进行了测试，接触力系统性变化。连续振动和间歇性的表面粗糙度测量，以阐明在体内髋关节吱吱声的潜在原因。三阶段测试包括边缘加载（EL）和同心关节（CA）的交替循环，始终使用充足的血清润滑剂。一项50，000次循环的磨损试验，其中CA期间的贴靠力远离股骨头的磨损片，没有产生吱吱声，几乎没有内衬粗糙化。在边缘磨损股骨头与原始内衬配合使用的10个周期试验中，贴靠力的大小和施加点不同;仅当贴靠力超过临界阈值并集中在股骨头的磨损片上时，才会立即发生反复的吱吱声。在27，000次循环磨损试验中，在股骨头磨损片边缘附近施加贴靠力，随着内衬内表面通过其与股骨头磨损部分的关节面变得粗糙，反复出现吱吱声。结果揭示了在各种情况下产生经常性吱吱声的关键条件，而无需求助于难以置信的干燥条件。一个基本的理论解释说，髋关节吱吱声是由无数的应力波产生的凹凸碰撞，但根本原因是边缘负荷。© 2012骨科研究学会。出版社：Wiley Periodicals，Inc. J Orthop Res 30：1377-1383，2012
Ceramic‐on‐ceramic (CoC) hip bearings were tested in short‐term wear tests with a systematically varied contact force. Continuous vibration and intermittent surface roughness measurements were obtained to elucidate potential causes of in vivo hip joint squeaking. The three‐phase test comprised alternating cycles of edge loading (EL) and concentric articulation (CA), always using ample serum lubricant. A 50,000‐cycle wear trial in which the contact force during CA was distant from the head's wear patch yielded no squeaking and practically no liner roughening. In 10‐cycle trials of an edge‐worn head coupled with a pristine liner, the contact force was varied in magnitude and point of application; immediate, recurrent squeaking occurred only when the contact force exceeded a critical threshold value and was centered upon the head's wear patch. In a 27,000‐cycle wear trial with the contact force applied near the margin of the head's wear patch, recurrent squeaking emerged progressively as the liner's inner surface was roughened via its articulation with the worn portion of the head. The results reveal key conditions that yield recurrent squeaking in vitro in various scenarios without resorting to implausible dry conditions. A fundamental theory explains that hip squeaking is induced by myriad stress waves emanating from asperity collisions; yet, the root cause is edge loading. © 2012 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 30:1377–1383, 2012