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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Chemistry‐driven structural alterations in short‐term retrieved ceramic‐on‐metal hip implants: Evidence for in vivo in vivo incompatibility between ceramic and metal counterparts
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Chemistry‐driven structural alterations in short‐term retrieved ceramic‐on‐metal hip implants: Evidence for in vivo in vivo incompatibility between ceramic and metal counterparts

机译：短期内的化学驱动的结构改变陶瓷上的金属臀部植入物：体内陶瓷和金属对应物体内体内的证据

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Abstract Ceramic‐on‐metal (CoM) hip implants were reported to experience lower wear rates in vitro as compared to metal‐on‐metal (MoM) bearings, thus hinting metal‐ion release at lower levels in vivo . In this article, we show a spectroscopic study of two short‐term retrieval cases of zirconia‐toughened alumina (ZTA) femoral heads belonging to CoM hip prostheses, which instead showed poor wear performances in vivo . Metal contamination and abnormally high fractions of tetragonal‐to‐monoclinic ( t → m ) polymorphic transformation of the zirconia phase could be found on both ZTA heads, which contrasted with the optimistic predictions of in vitro experiments. At the molecular scale, incorporation of metal ions into the ceramic lattices could be recognized as due to frictionally assisted phenomena occurring at the ceramic surface. Driven by abnormal friction, diffusion of metal ions induced lattice shrinkage in the zirconia phases, while residual stress fields became stored at the surface of the femoral head. Diffusional alterations destabilized the chemistry of the ceramic surface and resulted in an abnormal increase in t → m phase transformation in vivo . Frictionally driven metal transfer to the ceramic lattice thus hinders the in vivo performance of CoM prostheses. ? 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 1469–1480, 2017.
机译：据报道，与金属金属（MOM）轴承相比，据报道，据报道，陶瓷上金属（COM）髋植入体体体外体外经历较低的磨损率，从而在体内较低水平下暗示金属离子释放。在本文中，我们展示了属于COM HIP假体的两种短期检索菌头的两种短期检索病例的光谱研究，而是在体内显示出较差的磨损性能。在ZTA头上可以发现金属污染和四甲基单斜（T→M）多晶型转化的四甲基单斜（T→M）多态性转化，其与体外实验的乐观预测形成鲜明对比。在分子尺度上，可以将金属离子掺入陶瓷格子中，因为在陶瓷表面发生摩擦辅助现象。由异常摩擦驱动，金属离子诱导氧化锆相的晶格收缩的扩散，而残留应力场储存在股骨头的表面。扩散改变不稳定陶瓷表面的化学性质，并导致体内T→M相转化的异常增加。摩擦驱动的金属转移到陶瓷晶格，因此阻碍了COM假体的体内性能。还2016 Wiley期刊，Inc .J生物保解率A件B：苹果生物检索物，105B：1469-1480,2017。

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