Wu Yabin, Ferguson Stephen J
a Institute for Biomechanics , ETH Zurich , Zurich , Switzerland.
Comput Methods Biomech Biomed Engin. 2017 Feb;20(3):250-259. doi: 10.1080/10255842.2016.1215438. Epub 2016 Aug 1.
Self-lubrication of a diarthrodial joint is largely attributed to interstitial fluid pressurisation. However, the retention of synovial fluid within the intra-articular gap may also contribute to lubrication. Fluid flow in the intra-articular gap between two micro-rough cartilage surfaces was simulated with a three-dimensional numerical model. Representative surface roughness parameters were incorporated and their relative influence on gap flow resistance was quantified. Resistance changes with decreasing gap height were explored. Cartilage surface micro-topography improves the retention of viscous synovial fluid in the gap, through increased resistance to tangential flow. Local asperity contact greatly increases resistance through tortuosity of the flow path.
滑膜关节的自润滑很大程度上归因于组织液增压。然而，关节内间隙中滑液的留存也可能有助于润滑。用三维数值模型模拟了两个微粗糙软骨表面之间关节内间隙中的流体流动。纳入了代表性的表面粗糙度参数，并量化了它们对间隙流动阻力的相对影响。探讨了阻力随间隙高度减小的变化情况。软骨表面微观形貌通过增加对切向流动的阻力，改善了粘性滑液在间隙中的留存。局部粗糙接触通过流动路径的曲折大大增加了阻力。
