Early failure of a zirconia femoral head prosthesis: Fracture or fatigue?
Early failure of a zirconia femoral head prosthesis: Fracture or fatigue?
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DOI：
10.1016/j.clinbiomech.2007.04.007
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发表时间：
2007-08-01
影响因子：
1.8
通讯作者：
Mouzakis, Dionysios E.
中科院分区：
文献类型：
--
作者：
Panagiotopoulos, Elias C.;Kallivokas, Alkiviadis G.;Mouzakis, Dionysios E.
背景锆陶瓷是最有争议的生物修复材料之一，一方面具有良好的机械性能，但另一方面早期失效事件。本文报告一例73岁的神职人员在接受全髋关节置换术28个月后发生氧化锆股骨头早期失效的病例。使用扫描电子显微镜对翻修手术中取出的股骨头碎片进行研究。尽管无生物力学意义的随机发生的断裂可能是一种解释，但收集的数据证明，由于陶瓷股骨头和金属锥形股骨颈之间的接触应力或应变不匹配或两者导致的初始非关键微裂纹或银纹导致材料疲劳。最后的结果是头部的灾难性骨折。将股骨颈固定到氧化锆股骨头中，没有不匹配或应力差异，将解决疲劳引起的股骨头破坏。(c)2007爱思唯尔有限公司保留所有权利。
Background Zirconium ceramics are one of the most controversial prosthetic biomaterials with good mechanical properties on the one hand, but early failure incidents on the other hand. A case of an early failure of zirconia femoral head in a 73-year-old clergy man, who underwent a total hip arthroplasty 28 months before, is reported.Method. The retrieved femoral head fragments, during revision surgery, were studied using scanning electron microscopy.Findings. Although a randomly occurred fracture without biomechanical significance can be a possible explanation, the collected data give evidence that initial non-critical microcracks or crazes due to contact stresses or strain mismatches or both between the ceramic head and the metallic tapered neck of the prosthesis led to the fatigue of the material. The final outcome was a catastrophic fracture of the head.Interpretation. Fixation of the neck into the zirconia head, with no mismatching or stress differences, would solve the fatigue-induced head destruction. (c) 2007 Elsevier Ltd. All rights reserved.