Fisher J, Firkins P, Reeves E A, Hailey J L, Isaac G H
Department of Mechanical Engineering, University of Leeds.
Proc Inst Mech Eng H. 1995;209(4):263-4. doi: 10.1243/PIME_PROC_1995_209_353_02.
A number of studies of explanted metallic femoral heads have shown scratches or damage caused by bone cement, bone or metallic particles. This damage has been cited as a cause of increased wear of ultra-high molecular weight polyethylene (UHMWPE) acetabular cups. In this laboratory study, small scratches 2 mu m deep were made on smooth stainless steel surfaces at a spacing of 10 mm. These individual scratches were found to increase the wear rate of UHMWPE by a factor of 30 in unidirectional sliding and a factor of 70 in reciprocating motion. It is of particular concern that a single small scratch, which is not detected by the average surface roughness measurement Ra can cause such a dramatic increase in the wear of ultra-high molecular weight polyethylene.
多项对取出的金属股骨头的研究表明，存在由骨水泥、骨头或金属颗粒造成的划痕或损伤。这种损伤被认为是超高分子量聚乙烯（UHMWPE）髋臼杯磨损增加的一个原因。在这项实验室研究中，在光滑不锈钢表面上以10毫米的间距制作了深度为2微米的小划痕。结果发现，这些单个划痕在单向滑动时使UHMWPE的磨损率提高了30倍，在往复运动时提高了70倍。特别值得关注的是，一个普通表面粗糙度测量值Ra检测不到的单个小划痕，就能导致超高分子量聚乙烯的磨损大幅增加。
