Precision surface machining to bearing surface of artificial joint

超高分子量聚乙烯（UHMWPE）作为承载材料广泛应用于硬聚合物关节假体中；然而，磨损颗粒被认为是长期骨溶解和植入物松动的主要因素。常规接头上常用的Co-Cr-Mo合金表面粗糙度为10 ~ 20纳米，而精加工后的合金表面粗糙度为1 ~ 2纳米，呈分散凹凸状。精密表面加工方法是一种典型的研磨加工方法，但浆料与加工表面之间的关系受到严格控制。新的表面减少了超高分子量聚乙烯的磨损量，这将确保接头的长期耐用性。新表面增大了超高分子量聚乙烯颗粒的尺寸。用颗粒培养细胞。新表面产生的磨损颗粒抑制了IL-6的产生。

Ultra-high molecular weight polyethylene (UHMWPE) is widely used as bearing material in a polymer-on-hard joint prosthesis; however, the wear particles are considered to be a major factor in long-term osteolysis and loosening of implants. Although the generally used surface on Co-Cr-Mo alloy for a conventional joint has 10-20 nanometer roughness, the new surface on the alloy with finishing through the precision machining has 1-2 nanometer roughness scattered concavo-shapes. The precision surface machining method is a kind of the typical lapping method, but relationship between slurry and machining surface had been strictly controlled. The new surface reduced the amount of UHMWPE wear, which would ensure the long-term durability of joints. The new surface enlarged the size of UHMWPE particles. Cells were cultured with the particles. The wear particles generated on the new surface inhibited the production of IL-6.