Tateiwa Toshiyuki, Clarke Ian C, Pezzotti Giuseppe, Sedel Laurent, Kumakura Tsuyoshi, Shishido Takaaki, Yamamoto Kengo
Orthopaedic Research Center and Peterson Tribology Laboratory, Department of Orthopaedic Surgery, Loma Linda University Medical Center, California, USA.
J Biomed Mater Res B Appl Biomater. 2007 Nov;83(2):562-70. doi: 10.1002/jbm.b.30829.
We analyzed wear pattern of long-term retrieved alumina-alumina hip prostheses from Osteal, which were implanted for 15-19 years. A comparison was carried out with our previous study of 17-year Biolox alumina-on-alumina hip prostheses, (Shishido et al., J Biomed Mater Res B 2003;67:638-647) and all-alumina total hip replacement run under microseparation simulator tests. Of particular interest was the occurrence of stripe wear in these first generation alumina ceramic bearings. Two balls of Osteal revealed only one stripe wear as did the respective liners on their rim areas. In these latter balls, the stripes were shallower than those previously observed in Biolox implants. A microscopic analysis of the bearing surface was carried out using scanning electron microscopy and fluorescence microprobe spectroscopy. On average, the Osteal retrievals had one grade lower wear than Biolox retrievals. Fluorescence microprobe maps showed that Biolox ball surfaces had higher compressive stress than the Osteal likely due to severe impingement and microseparation promoted by the bulky implant design.
我们分析了从Osteal长期取出的氧化铝-氧化铝髋关节假体的磨损模式，这些假体植入了15至19年。将其与我们之前对使用17年的Biolox氧化铝对氧化铝髋关节假体的研究（Shishido等人，《生物医学材料研究杂志B》2003年；67：638 - 647）以及在微分离模拟器测试下运行的全氧化铝全髋关节置换进行了比较。特别令人感兴趣的是这些第一代氧化铝陶瓷轴承中条纹磨损的出现。Osteal的两个球头仅显示出一条条纹磨损，其相应的髋臼杯边缘区域也是如此。在这些后者的球头中，条纹比之前在Biolox植入物中观察到的要浅。使用扫描电子显微镜和荧光微探针光谱对轴承表面进行了微观分析。平均而言，Osteal取出物的磨损程度比Biolox取出物低一级。荧光微探针图谱显示，Biolox球头表面的压应力高于Osteal，这可能是由于笨重的植入物设计导致的严重撞击和微分离所致。
