Oonishi Hironobu, Ueno Masaru, Kim Sok Chol, Oonishi Hiroyuki, Iwamoto Mikio, Kyomoto Masayuki
H. Oonishi Memorial Joint Replacement Institute, Tominaga Hospital, Naniwa-ku, Osaka, Japan.
J Arthroplasty. 2009 Apr;24(3):374-82. doi: 10.1016/j.arth.2007.10.021. Epub 2008 Jun 4.
The present study aimed to determine the effect of femoral component materials and sterilization methods on wear properties of total knee prostheses by using a knee simulator test and retrieval analysis. The simulator test revealed that ultrahigh molecular weight polyethylene (UHMWPE) inserts had remarkably lower wear against the ceramic femoral component than against the Co-Cr femoral component. However, the retrieval study revealed no significant difference in the linear wear between the former and the latter. The alumina ceramic/UHMWPE insert combination showed a mild wear. However, whether cross-linking by gamma-ray sterilization reduces wear remained unconfirmed. In contrast, oxidative degradation and/or delamination was confirmed. Thus, we conclude that alumina ceramic/ethylene oxide gas-sterilized UHMWPE insert in a total knee prosthesis might exhibit a good wear resistance.
本研究旨在通过膝关节模拟器测试和翻修分析，确定股骨部件材料和灭菌方法对全膝关节假体磨损性能的影响。模拟器测试显示，超高分子量聚乙烯（UHMWPE）内衬与陶瓷股骨部件相比，磨损显著更低。然而，翻修研究显示，前者与后者之间的线性磨损无显著差异。氧化铝陶瓷/UHMWPE内衬组合显示出轻微磨损。然而，伽马射线灭菌交联是否能减少磨损仍未得到证实。相比之下，氧化降解和/或分层得到了证实。因此，我们得出结论，全膝关节假体中氧化铝陶瓷/环氧乙烷气体灭菌的UHMWPE内衬可能具有良好的耐磨性。
