Orthopaedic Innovation Centre, Concordia Hip and Knee Institute, 1155 Concordia Avenue, R2K 2M9.
Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba, Canada.
J Arthroplasty. 2014 Oct;29(10):2049-52. doi: 10.1016/j.arth.2014.05.027. Epub 2014 Jun 5.
Eight retrieved metal-on-metal total hip replacements displayed corrosion damage along the cobalt-chromium alloy liner taper junction with the Ti alloy acetabular shell. Scanning electron microscopy indicated the primary mechanism of corrosion to be grain boundary and associated crevice corrosion, which was likely accelerated through mechanical micromotion and galvanic corrosion resulting from dissimilar alloys. Coordinate measurements revealed up to 4.3mm(3) of the cobalt-chromium alloy taper surface was removed due to corrosion, which is comparable to previous reports of corrosion damage on head-neck tapers. The acetabular liner-shell taper appears to be an additional source of metal corrosion products in modular total hip replacements. Patients with these prostheses should be closely monitored for signs of adverse reaction towards corrosion by-products.
8 例回收的金属对金属全髋关节置换术后假体显示出钴铬合金衬里与钛合金髋臼壳的锥度交界处存在腐蚀损伤。扫描电子显微镜表明，腐蚀的主要机制是晶界和相关的缝隙腐蚀，这可能是通过机械微动和不同合金之间的电偶腐蚀加速的。坐标测量显示，由于腐蚀，多达 4.3mm³的钴铬合金锥面被去除，这与之前关于头颈锥面腐蚀损伤的报道相当。髋臼衬里-壳锥度似乎是模块化全髋关节置换术后金属腐蚀产物的另一个来源。对于这些假体的患者，应密切监测对腐蚀副产物的不良反应迹象。
