Kop Alan M, Whitewood Colin, Johnston Don J L
Department of Medical Engineering and Physics, Royal Perth Hospital, Perth, Western Australia, Australia.
J Arthroplasty. 2007 Aug;22(5):775-9. doi: 10.1016/j.arth.2006.07.005. Epub 2007 Apr 20.
Oxinium exhibits 4900 times less volumetric wear and 640 times less deep scratches in laboratory wear testing compared with traditional cobalt-chromium alloys. Despite the superior wear resistance because of the thin ceramic surface, the zirconium alloy substrate is relatively soft (Hv = 285) when compared with cobalt-chrome alloy femoral heads (ISO 5832-12; Hv = ~420,) and may deform in contact with acetabular shell materials (ISO5832-3; Hv = 350) in the case of dislocation. Three retrieval cases highlight the damage that may occur during dislocation and/or when performing closed reduction maneuvers. It is recommended that closed reduction be attempted with caution because significant head damage can occur. This may lead to accelerated polyethylene wear. In the case of successful reduction, close patient follow-up is recommended. Open reduction with femoral head inspection and exchange may be preferable if difficulty is encountered in closed reduction maneuvers.
与传统钴铬合金相比，在实验室磨损测试中，二氧化锆陶瓷涂层金属（Oxinium）的体积磨损减少4900倍，深度划痕减少640倍。尽管由于其薄陶瓷表面而具有卓越的耐磨性，但与钴铬合金股骨头（ISO 5832-12；维氏硬度约为420）相比，锆合金基底相对较软（维氏硬度 = 285），并且在脱位情况下与髋臼杯材料（ISO 5832-3；维氏硬度 = 350）接触时可能会变形。三例翻修病例突出了脱位期间和/或进行闭合复位操作时可能发生的损伤。建议谨慎尝试闭合复位，因为可能会发生严重的股骨头损伤。这可能会导致聚乙烯磨损加速。如果闭合复位成功，建议密切随访患者。如果在闭合复位操作中遇到困难，进行股骨头检查和置换的切开复位可能更可取。
