IMBE Leeds University, Leeds, United Kingdom.
J Orthop Res. 2010 Aug;28(8):979-85. doi: 10.1002/jor.21100.
Edge-loading generates higher wear rates in ceramic-on-ceramic total hip prosthesis (THP). To investigate the friction coefficient (FC) in these conditions, three alumina ceramic (Biolox Forte) 32 mm-diameter components were tested using a hip friction simulator. The cup was positioned with a 75 degrees abduction angle to achieve edge-loading conditions. The motion was first applied along the edge and then across the edge of the cup. First, tests were conducted under lubricated conditions with 25% bovine serum. Next, to simulate an extremely high contact pressure, the tests were run with the addition of a third body alumina ceramic chip inserted between the edge of the cup and the head. Engineering blue was used to analyze the contact area. Reference values were determined using a 0 degrees cup abduction angle. Edge loading was achieved. The FC increased by three- to sixfold when the motion was applied along the edge, and by 70% when the motion was applied across the edge. However, the FC value was still low (about 0.1), which is similar to metal-on-metal THP. With the third body alumina ceramic particle inserted, the FC was 26 times higher than in the ideal conditions and intermittent squeaking occurred. High cup abduction angles may generate edge-loading and an increase in the friction coefficient for ceramic THP.
边缘加载会导致陶瓷对陶瓷全髋关节假体（THP）的更高磨损率。为了研究这些条件下的摩擦系数（FC），使用髋关节摩擦模拟器测试了三个 32 毫米直径的氧化铝陶瓷（Biolox Forte）部件。将杯定位在 75 度外展角以实现边缘加载条件。运动首先沿边缘施加，然后沿杯边缘施加。首先，在 25%牛血清润滑条件下进行测试。接下来，为了模拟极高的接触压力，在杯边缘和头部之间插入第三体氧化铝陶瓷片的情况下进行测试。使用工程蓝分析接触区域。使用 0 度杯外展角确定参考值。当运动沿边缘施加时，FC 增加了三到六倍，当运动沿边缘施加时，FC 增加了 70%。然而，FC 值仍然较低（约 0.1），类似于金属对金属 THP。当插入第三体氧化铝陶瓷颗粒时，FC 比理想条件高 26 倍，并且出现间歇性 squeaking。高杯外展角可能会导致陶瓷 THP 的边缘加载和摩擦系数增加。
