Stachowiak G W, Podsiadlo P
Department of Mechanical and Materials Engineering, University of Western Australia, Nedlands, Australia.
J Biomech. 1997 Apr;30(4):415-9. doi: 10.1016/s0021-9290(96)00144-3.
Pair of sheep knee joints were used in the experiments. One of the joints was worn in a simulator over different periods of time under carefully simulated physiological forces and kinematic cycles while the other, 'control joint', was kept intact for comparison. Wear particles were extracted from a synovial fluid from both the worn and unworn sheep joints by a ferrography technique and then examined in a scanning electron microscope (SEM). The shape of the particles was characterized by boundary fractal dimension, shape factor and convexity. The shape parameters obtained for particle populations were statistically compared using a Wilcoxon rank test. It has been found that subtle changes in the shape of the particle boundary occur during the wear process. Studying the changes in wear particle boundaries provides important information about the cause and progression of wear in synovial joints.
实验使用了一对羊膝关节。其中一个关节在模拟器中，在精心模拟的生理力和运动周期下，经过不同时间段的磨损，而另一个“对照关节”则保持完整用于比较。通过铁谱技术从磨损和未磨损的羊关节滑液中提取磨损颗粒，然后在扫描电子显微镜（SEM）下进行检查。颗粒的形状通过边界分形维数、形状因子和凸度来表征。使用Wilcoxon秩和检验对获得的颗粒群体形状参数进行统计学比较。研究发现，在磨损过程中颗粒边界形状会发生细微变化。研究磨损颗粒边界的变化为滑膜关节磨损的原因和进展提供了重要信息。
