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首页> 外文期刊>Coatings >Surface Properties of Retrieved Cementless Femoral Hip Endoprostheses Produced from a Ti6Al7Nb Alloy
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Surface Properties of Retrieved Cementless Femoral Hip Endoprostheses Produced from a Ti6Al7Nb Alloy

机译：Ti6Al7Nb合金制备的非骨水泥股骨髋关节内膜的表面性质

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We have investigated new and retrieved cementless hip endoprostheses that prematurely failed due to (i) aseptic loosening, (ii) infection and (iii) latent infection. The aim was to better understand the physico-chemical phenomena on the surfaces and sub-surfaces of the Ti6Al7Nb alloy implant. The results of our studies should enable us to distinguish the causes of premature failure, optimize the surface modification, achieve optimal osseointegration and extend the useful lifetime of the implants. The surface properties of the Ti6Al7Nb alloys of the hip-stem endoprostheses (30 retrieved and 2 new) were determined by contact-angle measurements and the average surface roughness. The surface chemistry and microstructure were analysed by scanning electron microscopy (SEM) for morphology, energy-dispersive X-ray spectroscopy (EDS) for the chemistry, and electron back-scatter diffraction (EBSD) for the phase analysis; Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS) for the surface chemistry; and electrochemical measurements for the corrosion. The improved wettability of the grit-blasted surface of the Ti6Al7Nb stems after autoclaving was measured, as was the super wettability after oxygen-plasma sterilization. The secondary-electron images showed that the morphology and microstructure of the new and retrieved stems (prematurely failed due to aseptic loosening, infection and latent infection) differ slightly, while the EDS analysis revealed corundum contamination of the grit-blasted surface. We found corundum-contaminated Ti6Al7Nb stem surfaces and sub-surfaces for all the investigated new and retrieved implants. These residues are a potential problem, i.e., third-body wear particles, and probably induce the osteolysis and aseptic loosening.
机译：我们已经研究了新的和回收的非骨水泥型髋关节假体，这些假体由于（i）无菌性松动，（ii）感染和（iii）潜伏性感染而过早失效。目的是更好地了解Ti6Al7Nb合金植入物的表面和亚表面的物理化学现象。我们的研究结果应使我们能够识别出过早失效的原因，优化表面改性，实现最佳的骨整合并延长植入物的使用寿命。通过接触角测量和平均表面粗糙度确定了髋关节干假体的Ti6Al7Nb合金（回收了30种，新增了2种）的表面性能。表面化学和微观结构通过扫描电子显微镜（SEM）进行形态分析，能量色散X射线光谱（EDS）进行化学分析，电子背散射衍射（EBSD）进行相分析。用于表面化学的俄歇电子能谱（AES）和X射线光电子能谱（XPS）;和电化学测量的腐蚀。高压灭菌后，测得的Ti6Al7Nb杆喷砂表面的润湿性得到了改善，氧等离子体灭菌后的超润湿性也得到了测量。二次电子图像显示，新茎和回收茎的形态和微观结构（由于无菌性松动，感染和潜伏感染而过早失效）略有不同，而EDS分析表明喷砂处理的表面刚玉受到污染。我们发现所有研究过的新植入物和回收植入物均受到刚玉污染的Ti6Al7Nb茎表面和亚表面。这些残留物是潜在的问题，即，第三体磨损颗粒，并且可能引起溶骨和无菌性松动。

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