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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Mechanical, chemical and biological damage modes within head‐neck tapers of CoCrMo and Ti6Al4V contemporary hip replacements
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Mechanical, chemical and biological damage modes within head‐neck tapers of CoCrMo and Ti6Al4V contemporary hip replacements

机译：COCRMO和TI6AL4V现代髋关节置换内的头颈锥体内机械，化学和生物损伤模式

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Abstract Total hip replacement (THR) failure due to mechanically assisted crevice corrosion within modular head‐neck taper junctions remains a major concern. Several processes leading to the generation of detrimental corrosion products have been reported in first generation modular devices. Contemporary junctions differ in their geometries, surface finishes, and head alloy. This study specifically provides an overview for CoCrMo/CoCrMo and CoCrMo/Ti6Al4V head‐neck contemporary junctions. A retrieval study of 364 retrieved THRs was conducted which included visual examination and determination of damage scores, as well as the examination of damage features using scanning electron microscopy. Different separately occurring or overlapping damage modes were identified that appeared to be either mechanically or chemically dominated. Mechanically dominated damage features included plastic deformation, fretting, and material transfer, whereas chemically dominate damage included pitting corrosion, etching, intergranular corrosion, phase boundary corrosion, and column damage. Etching associated cellular activity was also observed. Furthermore, fretting corrosion, formation of thick oxide films, and imprinting were observed which appeared to be the result of both mechanical and chemical processes. The occurrence and extent of damage caused by different modes was shown to depend on the material, the material couple, and alloy microstructure. In order to minimize THR failure due to material degradation within modular junctions, it is important to distinguish different damage modes, determine their cause, and identify appropriate counter measures, which may differ depending on the material, specific microstructural alloy features, and design factors such as surface topography. ? 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1672–1685, 2018.
机译：摘要：由于模块化头颈锥形连接处的机械辅助缝隙腐蚀导致的全髋关节置换术（THR）失败仍然是一个主要问题。据报道，第一代模块化设备中存在几种导致产生有害腐蚀产物的工艺。当代的接头在几何形状、表面光洁度和头部合金方面有所不同。本研究特别概述了CoCrMo/CoCrMo和CoCrMo/Ti6Al4V头颈当代连接。对364个检索到的THR进行检索研究，包括目视检查和损伤评分测定，以及使用扫描电子显微镜检查损伤特征。确定了不同的单独发生或重叠的损伤模式，这些模式似乎以机械或化学方式为主。机械损伤主要包括塑性变形、微动磨损和材料转移，而化学损伤主要包括点蚀、蚀刻、晶间腐蚀、相界腐蚀和柱状损伤。还观察到与蚀刻相关的细胞活性。此外，还观察到微动腐蚀、厚氧化膜的形成和印记，这似乎是机械和化学过程的结果。不同模式造成的损伤的发生和程度取决于材料、材料耦合和合金微观结构。为了最大限度地减少模块化连接内材料退化导致的THR失效，区分不同的损伤模式、确定其原因并确定适当的应对措施非常重要，这些措施可能因材料、特定微观结构合金特征和表面形貌等设计因素而有所不同？2017威利期刊有限公司《生物医学材料研究》第B部分：Appl Biomater，106B:1672–16852018。

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