Department of Orthopaedic Surgery, Asahikawa Medical College, Midorigaoka, Asahikawa, Japan.
J Arthroplasty. 2010 Feb;25(2):302-8. doi: 10.1016/j.arth.2009.01.010. Epub 2009 Feb 6.
The purposes of this study were to determine the spectrum of femoral head damage in patients undergoing revision total hip arthroplasty and to determine the impact of that damage on polyethylene wear. One hundred eight consecutive modular metal femoral heads were retrieved at revision surgery. The mean roughness (Ra) value was 0.18 +/- 0.18 microm. The roughest femoral heads (mean Ra, 0.56 microm) were from retrievals correlated with mode 2 wear (recurrent dislocation and complete wear through of the polyethylene liner). Five million cycles of wear tests were performed using retrieved femoral heads against both new conventional and highly cross-linked polyethylene. The mean wear rate of conventional polyethylene was 15.9 +/- 4.3 mg and that of highly cross-linked polyethylene was 0.04 +/- 0.14 mg per 1 million cycles (P < .001). Highly cross-linked polyethylene was more resistant to wear than conventional polyethylene, even when mated against roughened femoral heads.
本研究的目的是确定在接受翻修全髋关节置换术的患者中股骨头损伤的范围，并确定这种损伤对聚乙烯磨损的影响。在翻修手术中取出了 108 个连续的模块化金属股骨头。平均粗糙度（Ra）值为 0.18 +/- 0.18 微米。最粗糙的股骨头（平均 Ra 值为 0.56 微米）与模式 2 磨损（反复脱位和聚乙烯衬垫完全磨损）有关。使用从患者身上取出的股骨头对新的常规和高度交联聚乙烯进行了 500 万次磨损测试。常规聚乙烯的平均磨损率为 15.9 +/- 4.3 毫克，高度交联聚乙烯的磨损率为每 100 万次 0.04 +/- 0.14 毫克（P <.001）。即使与粗糙的股骨头配对，高度交联聚乙烯也比常规聚乙烯更耐磨。
