An analysis is presented of four short‐term retrieved highly crosslinked polyethylene (HXLPE) hip liners grafted with 2‐methacryloyloxyethyl phosphorylcholine (MPC) on their bearing surfaces, which were recently commercialized as a new generation of artificial hip joints. Straightforward evidences by X‐ray photoelectron spectroscopy (XPS) confirmed that the MPC layer peeled off on the bearing surface of all short‐term liners in both main wear and nonwear zones. Analyses by Fourier‐transform infrared spectroscopy with attenuated total reflection assessed the extent of surface oxidation and revealed the type of oxidative species. Electron spin resonance analyses, which compared retrievals and as‐received samples, revealed the presence of different species of alkoxyl CO^• radicals. This study suggests that MPC grafts on polyethylene do not offer any additional protection from oxidation and can delaminate prematurely after short‐term in vivo exposure.

中文翻译：

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从短期全髋关节置换术中取出的 MPC 移植高度交联聚乙烯衬垫：MPC 方法不适用的进一步证据。

对四个短期回收的高交联聚乙烯 (HXLPE) 髋关节衬垫进行了分析，这些衬垫在其支承表面上接枝了 2-甲基丙烯酰氧基乙基磷酰胆碱 (MPC)，这些衬垫最近作为新一代人工髋关节进行了商业化。X 射线光电子能谱（XPS）的直接证据证实 MPC 层在主要磨损区和非磨损区的所有短期衬里的轴承表面上都剥落。通过具有衰减全反射的傅里叶变换红外光谱分析评估了表面氧化的程度并揭示了氧化物质的类型。电子自旋共振分析比较了回收样品和接收样品，揭示了不同种类的烷氧基 CO ^•自由基。这项研究表明，聚乙烯上的 MPC 移植物不能提供任何额外的氧化保护，并且在短期体内暴露后会过早分层。