人工关节摩擦面形貌与摩擦特性的关系

On the Relationship Between the Morphology of Friction Surface and Friction Characteristics of Artificial Joint

高分子聚乙烯材料广泛用于人工关节,然而磨损颗粒激活巨噬细胞释放细胞因子,刺激破骨细胞导致骨吸收,研究表明,颗粒的体积和大小是巨噬细胞活化的关键因素,其中粒子的尺寸范围在0.1-1.0μm最具生物活性;增大颗粒尺寸可减少高分子聚乙烯材料的磨损量。本研究提出了一种以Co-Cr-Mo合金为基体的纳米级表面结构技术,具有纳米级沟槽的超细表面使高分子聚乙烯的磨损量减少,颗粒的形貌不变而尺寸增大。

An ultra-high molecular weight polyethylene (UHMWPE) is widely used as bearing material in artificial joints. However, the wear particles activate macrophages, which release cytokines, stimulates osteoclasts to result in bone resorption. Many researchers reported that the volume and size of particles were critical factors in macrophage activation, in which particles in the size range of 0.1-1.0μm are the most biological active. To minimize the amount of wear of UHMWPE and to enlarge the size of UHMWPE wear particle, a nano-level surface texturing on Co-Cr-Mo alloy as a counterface material was invented. The superfine surface with nano-level grooves and dimples reduced the amount of UHMWPE wear, and did not change the morphological aspect of UHMWPE particle, but enlarged the size of UHMWPE particle.