Modelling of fluid support inside articular cartilage during sliding
Modelling of fluid support inside articular cartilage during sliding
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DOI：
10.1243/13506501jet241
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发表时间：
2007-05-01
影响因子：
2
通讯作者：
Fisher, J.
中科院分区：
文献类型：
--
作者：
Pawaskar, S. S.;Jin, Z. M.;Fisher, J.
滑膜关节的润滑机制引起了人们的广泛关注。双相润滑是 Mow 和 Lai [1] 基于关节软骨流体和固相之间的载荷分配机制提出的。福斯特等人。 [12] 进行了实验研究来调查同样的问题，而 Ateshian 等人。 [13, 17] 利用组织液加压对其进行了理论上的进一步研究。 Forster 和 Fisher [15] 表明，启动摩擦系数高于各种滑动条件下的摩擦系数，并且软骨的双相性质确实在关节润滑中发挥着重要作用。一些研究人员已经对软骨的摩擦行为进行了实验和理论研究；然而，有限元建模相比而言要少得多，并且主要关注变形而不是滑动条件。在本研究中，开发了两个有限元模型来研究滑动对软骨中流体负载支撑的影响及其对摩擦和润滑特性的影响。静态模型预测的结果与金属板在软骨表面上滑动给出的结果相同，而金属圆柱形压头在软骨表面上滑动且接触区域迁移的模型在相对较长的时间内显示出明显更高的流体负载支持。该结果与 Forster 和 Fisher [15] 以及 Bell 等人提出的实验结果一致。 [24]并且一般来说，与其他研究人员关于哭泣、增压和自生润滑机制的研究一样。需要进行进一步广泛的研究，将有限元预测与其他条件下的实验研究进行比较。
Considerable attention has been drawn to the lubricating mechanism of synovial joints. Biphasic lubrication was proposed by Mow and Lai [1] based on the load partitioning mechanism between fluid and solid phases of articular cartilage. Forster et al. [12] carried out experimental studies to investigate the same, whereas Ateshian et al. [13, 17] further investigated it theoretically using interstitial fluid pressurization. Forster and Fisher [15] showed that start-up frictional coefficient was higher than that under a wide range of sliding conditions and that biphasic nature of the cartilage does play a significant role in joint lubrication. The experimental and theoretical studies of frictional behaviour of the cartilage have been carried out by several researchers; however, finite-element modelling is far less in comparison, and mainly focused on deformation rather than sliding conditions. In the present study, two finite-element models were developed to study the effect of sliding on fluid load support in the cartilage and its implications to frictional and lubricating characteristics. The results predicted by the static model were same as those given by a metallic plate sliding over the cartilage surface, whereas the model of a metallic cylindrical indenter sliding over the cartilage surface with the migrating contact area showed remarkably higher fluid load support for relatively long-time durations. The results agreed with the experimental results presented by Forster and Fisher [15] and Bell et al. [24] and, in general, with those of other researchers with respect to weeping, boosted, and self-generating lubrication mechanism. Further extensive studies need to be carried out to compare the finite-element prediction with the experimental studies under other conditions.