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首页> 外文期刊>Acta biomaterialia >Retrospective lifetime estimation of failed and explanted diamond-like carbon coated hip joint balls
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Retrospective lifetime estimation of failed and explanted diamond-like carbon coated hip joint balls

机译：回顾性评估失败和移植的类金刚石碳涂层髋关节球的寿命

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Diamond-like carbon (DLC) coatings are known to have extremely low wear in many technical applications. The application of DLC as a coating has aimed at lowering wear and to preventing wear particle-induced osteolysis in artificial hip joints. In a medical study femoral heads coated with diamond-like amorphous carbon, a subgroup of DLC, articulating against polyethylene cups were implanted between 1993 and 1995. Within 8.5 years about half of the hip joints had to be revised due to aseptic loosening. The explanted femoral heads showed many spots of local coating delamination. Several of these explanted coated TiAlV femoral heads have been analyzed to investigate the reason for this failure. Raman analysis and X-ray photoelectron spectroscopy (XPS) depth profiling showed that the coating consists of diamond-like amorphous carbon, several Si-doped layers and an adhesion-promoting Si interlayer. Focused ion beam (FIB) transverse cuts revealed that the delamination of the coatings is caused by in vivo corrosion of the Si interlayer. Using a delamination test set-up dissolution of the silicon adhesion-promoting interlayer at a speed of more than 100 μm year -1 was measured in vitro in solutions containing proteins. Although proteins are not directly involved in the corrosion reactions, they can block existing small cracks and crevices under the coating, hindering the exchange of liquid. This results in a build-up of crevice corrosion conditions in the crack, causing a slow dissolution of the Si interlayer.
机译：已知类金刚石碳（DLC）涂层在许多技术应用中具有极低的磨损。 DLC作为涂层的应用旨在降低磨损，并防止人造髋关节中磨损引起的骨溶解。在一项医学研究中，在1993年至1995年之间植入了覆有类金刚石无定形碳的股骨头，一个与聚乙烯杯铰接的DLC亚组。在8.5年内，由于无菌性松动，约有一半的髋关节需要进行修复。移植的股骨头显示出许多局部包膜分层的斑点。已经对这些外植涂层的TiAlV股骨头中的几个进行了分析，以调查这种失败的原因。拉曼分析和X射线光电子能谱（XPS）深度剖析表明，该涂层由类金刚石无定形碳，几个掺Si层和一个增粘Si中间层组成。聚焦离子束（FIB）横向切割显示涂层的分层是由Si中间层的体内腐蚀引起的。使用分层测试设置，在含有蛋白质的溶液中，体外以大于100μmyear -1的速度测量了促进硅粘合的中间层的溶出度。尽管蛋白质不直接参与腐蚀反应，但它们会阻塞涂层下存在的细小裂纹和缝隙，从而阻碍了液体的交换。这导致在裂纹中形成缝隙腐蚀条件，从而导致Si中间层的缓慢溶解。

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