Ilo Kevin C, Derby Emma J, Whittaker Robert K, Blunn Gordon W, Skinner John A, Hart Alister J
Institute of Orthopaedics and Musculoskeletal Science, University College London, Royal National Orthopaedic Hospital, Stanmore, Middlesex, United Kingdom.
J Arthroplasty. 2017 May;32(5):1679-1683. doi: 10.1016/j.arth.2016.12.024. Epub 2016 Dec 22.
The R3 acetabular system used with its metal liner has higher revision rates when compared to its ceramic and polyethylene liner. In June 2012, the medical and healthcare products regulatory agency issued an alert regarding the metal liner of the R3 acetabular system.
Six retrieved R3 acetabular systems with metal liners underwent detailed visual analysis using macroscopic and microscopic techniques.
Visual analysis discovered corrosion on the backside of the metal liners. There was a distinct border to the areas of corrosion that conformed to antirotation tab insertions on the inner surface of the acetabular shell, which are for the polyethylene liner. Scanning electron microscopy indicated evidence of crevice corrosion, and energy-dispersive X-ray analysis confirmed corrosion debris rich in titanium.
The high failure rate of the metal liner option of the R3 acetabular system may be attributed to corrosion on the backside of the liner which appear to result from geometry and design characteristics of the acetabular shell.
与陶瓷和聚乙烯衬垫相比，R3髋臼系统搭配金属衬垫使用时的翻修率更高。2012年6月，医疗和保健产品监管机构发布了关于R3髋臼系统金属衬垫的警示。
对六个取出的带有金属衬垫的R3髋臼系统使用宏观和微观技术进行了详细的视觉分析。
视觉分析发现金属衬垫背面存在腐蚀。腐蚀区域有明显边界，与髋臼壳内表面用于聚乙烯衬垫的防旋转凸片插入位置相符。扫描电子显微镜显示有缝隙腐蚀的迹象，能量色散X射线分析证实腐蚀碎片富含钛。
R3髋臼系统金属衬垫选项的高故障率可能归因于衬垫背面的腐蚀，这似乎是由髋臼壳的几何形状和设计特点导致的。
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