Saikko V, Pfaff H G
Helsinki University of Technology, Department of Mechanical Engineering, Finland.
Acta Orthop Scand. 1998 Oct;69(5):443-8. doi: 10.3109/17453679808997776.
We studied the wear of state-of-the-art alumina/alumina total hip joints with the uniaxial five-station, and the three-axis single-station hip joint simulators of Helsinki University of Technology. The diameters of the joints were 26, 28 and 32 mm. Visual examination and weighing of the components showed no wear. Scanning electron microscopy showed that (a) the wear marks were slight, consisting of removal of grains, multidirectional grooving and mild abrasion, (b) the wear mechanisms were similar to those seen in components removed from patients, and (c) there was no marked difference in the specimens worn in the uniaxial vs. three-axis simulator. The coefficient of friction was measured throughout the 5 million cycle wear test with the three-axis simulator. The average value was 0.007. We conclude that alumina/alumina joints had low wear and friction under the present test conditions. The results are promising, since minimal wear is one of the prerequisites for long-term success in prosthetic joints.
我们使用赫尔辛基理工大学的单轴五工位及三轴单工位髋关节模拟器，研究了最先进的氧化铝/氧化铝全髋关节的磨损情况。这些关节的直径分别为26毫米、28毫米和32毫米。对部件进行目视检查和称重，未发现磨损。扫描电子显微镜显示：（a）磨损痕迹轻微，包括颗粒去除、多方向沟槽和轻度磨损；（b）磨损机制与从患者体内取出的部件中观察到的相似；（c）在单轴模拟器和三轴模拟器中磨损的标本之间没有显著差异。使用三轴模拟器在整个500万次循环磨损试验中测量了摩擦系数。平均值为0.007。我们得出结论，在当前测试条件下，氧化铝/氧化铝关节具有低磨损和低摩擦。由于最小磨损是假体关节长期成功的先决条件之一，因此结果很有前景。
