Stewart Todd D, Tipper Joanne L, Insley Gerard, Streicher Robert M, Ingham Eileen, Fisher John
Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, United Kingdom.
J Arthroplasty. 2003 Sep;18(6):726-34. doi: 10.1016/s0883-5403(03)00204-3.
The wear of zirconia femoral heads against alumina acetabular inserts with swing-phase microseparation was investigated in a hip joint simulator. Under mild microseparation conditions, the wear was very low, with an average wear rate of 0.05 mm(3)/million cycles reported over 5 million cycles of testing. However, under severe microseparation conditions representative of greater joint laxity, the wear rate of zirconia against alumina increased by 2 orders of magnitude, producing severe wear and, in one case, femoral head fracture. The adverse results of this study indicate that the combination of a zirconia femoral head articulating against an alumina acetabular insert is not recommended for clinical use. The results further raise concerns over the suitability of conventional simulators in evaluating the wear of ceramic hip prostheses.
在髋关节模拟器中研究了氧化锆股骨头与带有摆动期微分离的氧化铝髋臼内衬之间的磨损情况。在轻度微分离条件下，磨损非常低，在500万次测试循环中报告的平均磨损率为0.05立方毫米/百万次循环。然而，在代表关节松弛度更大的严重微分离条件下，氧化锆与氧化铝之间的磨损率增加了2个数量级，产生了严重磨损，并且在一个案例中出现了股骨头骨折。这项研究的不良结果表明，不建议临床使用氧化锆股骨头与氧化铝髋臼内衬组合的产品。这些结果进一步引发了人们对传统模拟器在评估陶瓷髋关节假体磨损方面适用性的担忧。
