Myant Connor, Cann Philippa
Tribology Group, Imperial College London, UK.
Tribology Group, Imperial College London, UK.
J Mech Behav Biomed Mater. 2014 Jun;34:338-48. doi: 10.1016/j.jmbbm.2013.12.016. Epub 2014 Jan 8.
Artificial articular joints present an interesting, and difficult, tribological problem. These bearing contacts undergo complex transient loading and multi axes kinematic cycles, over extremely long periods of time (>10 years). Despite extensive research, wear of the bearing surfaces, particularly metal-metal hips, remains a major problem. Comparatively little is known about the prevailing lubrication mechanism in artificial joints which is a serious gap in our knowledge as this determines film formation and hence wear. In this paper we review the accepted lubrication models for artificial hips and present a new concept to explain film formation with synovial fluid. This model, recently proposed by the authors, suggests that interfacial film formation is determined by rheological changes local to the contact and is driven by aggregation of synovial fluid proteins. The implications of this new mechanism for the tribological performance of new implant designs and the effect of patient synovial fluid properties are discussed.
人工关节存在一个有趣但又困难的摩擦学问题。这些轴承接触面要经历复杂的瞬态载荷和多轴运动循环，且持续时间极长（超过10年）。尽管进行了广泛研究，但轴承表面的磨损，尤其是金属对金属的髋关节磨损，仍然是一个主要问题。关于人工关节中普遍存在的润滑机制，我们了解得相对较少，这是我们知识上的一个严重空白，因为这决定了膜的形成，进而决定了磨损情况。在本文中，我们回顾了公认的人工髋关节润滑模型，并提出了一个用滑液解释膜形成的新概念。这个模型是作者最近提出的，表明界面膜的形成取决于接触部位局部的流变学变化，并由滑液蛋白质的聚集驱动。讨论了这种新机制对新型植入物设计摩擦学性能的影响以及患者滑液特性的作用。
