Minakawa H, Stone M H, Wroblewski B M, Lancaster J G, Ingham E, Fisher J
University of Leeds, England, UK.
J Bone Joint Surg Br. 1998 Sep;80(5):894-9. doi: 10.1302/0301-620x.80b5.8675.
We examined stainless-steel, cobalt-chrome, titanium and alumina and zirconia ceramic femoral heads retrieved at revision surgery. All the heads had articulated against ultra-high-molecular-weight-polyethylene (UHMWPE) acetabular cups. We studied the simulation of third-body damage and the wear of UHMWPE against the various materials used for the heads. The surfaces of the retrieved heads were analysed using a two-dimensional contacting profilometer. Third-body damage was characterised by the mean height of the scratches above the mean line (Rpm). The alumina ceramic and zirconia ceramic retrieved heads were found to have significantly less damage. In laboratory studies the ceramics were also more resistant to simulated third-body damage than the metal alloys. We studied the wear of UHMWPE against the damaged counterfaces in simple configuration tests. The damaged ceramics produced less polyethylene wear than the damaged metal counterfaces. The wear factor of UHMWPE against the damaged materials was dependent on the amount of damage to the counterface (Rp). Our study has shown the benefit of using the harder and more damage-resistant ceramic materials for femoral heads.
我们检查了在翻修手术中取出的不锈钢、钴铬合金、钛以及氧化铝和氧化锆陶瓷股骨头。所有这些股骨头均与超高分子量聚乙烯（UHMWPE）髋臼杯相铰接。我们研究了三体损伤的模拟情况以及UHMWPE与用于股骨头的各种材料之间的磨损情况。使用二维接触式轮廓仪对取出的股骨头表面进行了分析。三体损伤通过划痕高于平均线的平均高度（Rpm）来表征。结果发现，取出的氧化铝陶瓷和氧化锆陶瓷股骨头的损伤明显更少。在实验室研究中，陶瓷对模拟三体损伤的耐受性也高于金属合金。我们在简单配置试验中研究了UHMWPE与受损配对表面之间的磨损情况。受损陶瓷产生的聚乙烯磨损比受损金属配对表面更少。UHMWPE与受损材料之间的磨损系数取决于配对表面的损伤量（Rp）。我们的研究表明了使用更硬且更耐损伤的陶瓷材料作为股骨头的益处。
