Hothi Harry S, Ilo Kevin, Whittaker Robert K, Eskelinen Antti, Skinner John A, Hart Alister J
Institute of Orthopaedics and Musculoskeletal Science, University College London and the Royal National Orthopaedic Hospital, Stanmore, United Kingdom.
The Coxa Hospital for Joint Replacement, Tampere, Finland.
J Arthroplasty. 2015 Sep;30(9):1652-6. doi: 10.1016/j.arth.2015.03.022. Epub 2015 Mar 31.
Numerous studies have reported on corrosion at the modular head taper, however less is known about the interface between the metal shell and liner of modular cups. This study examined the backside of a series of metal modular cup liners of two designs (DePuy Pinnacle and Smith & Nephew R3), retrieved from 67 patients. Visual inspection found evidence of corrosion in virtually all liners, with the engaging rim surface significantly more corroded than the polar regions (P<0.001). EDX confirmed that black surface deposits were chromium rich corrosion debris, while SEM analysis revealed considerable pitting in the vicinity of the black debris. The R3 liners were significantly more corroded that the Pinnacles (P<0.001); this may help to explain the higher revision rates of this design.
许多研究都报道了模块化头部锥度处的腐蚀情况，然而对于模块化髋臼杯金属外壳与内衬之间的界面了解较少。本研究检查了从67例患者身上取出的两种设计（DePuy Pinnacle和Smith & Nephew R3）的一系列金属模块化髋臼杯内衬的背面。目视检查发现几乎所有内衬都有腐蚀迹象，啮合边缘表面的腐蚀明显比极地地区更严重（P<0.001）。能谱分析证实黑色表面沉积物是富含铬的腐蚀碎片，而扫描电子显微镜分析显示黑色碎片附近有大量麻点。R3内衬的腐蚀明显比Pinnacle内衬更严重（P<0.001）；这可能有助于解释该设计较高的翻修率。
