Psychoyios V, Crawford R W, O'Connor J J, Murray D W
Nuffield Orthopaedic Centre, Oxford, England.
J Bone Joint Surg Br. 1998 Nov;80(6):976-82. doi: 10.1302/0301-620x.80b6.8176.
Many designs of unicompartmental knee replacement show early and mid-term failure due to polyethylene wear. We studied the wear rate of congruent polyethylene meniscal bearings retrieved from failed Oxford unicompartmental knee replacements. We examined 16 bearings, 0.8 to 12.8 years after implantation, measuring their thickness and comparing it with that of 14 unused bearings. The mean rate of penetration, which included the effects of wear at both upper and lower surfaces, was 0.036 mm per year (maximum 0.08). Bearings as thin as 3.5 mm wore no faster than thicker models, but ten with evidence of impingement had greater wear. The six bearings with no impingement showed a mean rate of penetration of 0.01 mm per year. In unicompartmental knee replacement, careful implantation of fully congruous meniscal bearings can avoid failure due to polyethylene wear.
许多单髁膝关节置换设计因聚乙烯磨损而出现早期和中期失败。我们研究了从失败的牛津单髁膝关节置换中取出的全贴合聚乙烯半月板轴承的磨损率。我们检查了16个植入后0.8至12.8年的轴承，测量其厚度并与14个未使用的轴承进行比较。包括上下表面磨损影响的平均穿透率为每年0.036毫米（最大0.08）。薄至3.5毫米的轴承磨损速度并不比厚型号快，但有撞击迹象的10个轴承磨损更大。六个无撞击迹象的轴承平均每年穿透率为0.01毫米。在单髁膝关节置换中，仔细植入完全贴合的半月板轴承可避免因聚乙烯磨损导致的失败。
