Thomas T R, Sayles R S, Haslock I
J Biomech Eng. 1980 Feb;102(1):50-6. doi: 10.1115/1.3138198.
It is known that the surface of articular cartilage is rough and it has been suggested that this is likely to affect the lubrication of human joints. This paper describes the direct measurement of a cartilage surface with a stylus instrument. It is found that the height distribution is Gaussian with an inverse-square power spectrum. It is thus possible to calculate the elastic deflection of the surface under normal walking loads and it is shown that the mean separation of the cartilage surfaces in a human joint varies rather slowly with load. In one particular hip joint at heel strike the real area of contact was calculated to be about 1.3 cm2, the mean gap to be about 60 micrometers and the trapped volume to be about 80 percent of that when standing.
已知关节软骨表面粗糙，有人认为这可能会影响人体关节的润滑。本文描述了用触针仪对软骨表面进行的直接测量。发现高度分布呈高斯分布，具有反平方功率谱。因此，可以计算正常行走负荷下表面的弹性挠度，结果表明人体关节中软骨表面的平均间距随负荷变化相当缓慢。在一个特定的髋关节中，足跟触地时的实际接触面积经计算约为1.3平方厘米，平均间隙约为60微米，被困体积约为站立时的80%。
