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首页> 外文期刊>Acta biomaterialia >Raman tensor analysis of ultra-high molecular weight polyethylene and its application to study retrieved hip joint components.
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Raman tensor analysis of ultra-high molecular weight polyethylene and its application to study retrieved hip joint components.

机译：超高分子量聚乙烯的拉曼张量分析及其在研究髋关节成分中的应用。

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摘要

The angular dependences of the polarized Raman intensity of A(g), B(1g), B(2g), and B(3g) modes have been preliminary investigated on a model fiber sample of ultra-high molecular weight polyethylene (UHMWPE) in order to retrieve the Raman tensor elements, i.e. the intrinsic parameters governing the vibrational behavior of the orthorhombic structure of polyethylene. Based on this Raman analysis, a method is proposed for determining unknown crystallographic orientation patterns in UHMWPE biomedical components concurrently with the orientation distribution functions for orthorhombic lamellae. An application of the method is shown, in which we quantitatively examined the molecular orientation patterns developed on the surface of four in vivo exposed UHMWPE acetabular cups vs. an unused cup. Interesting findings were: (i) a clear bimodal distribution of orientation angles was observed on worn surfaces; and (ii) a definite and systematic increase in both molecular orientation and crystallinity in main wear zones vs. non-wear zones was found in all retrieved acetabular cups. The present crystallographic analysis is an extension of our previous Raman studies of UHMWPE acetabular cups related to assessments of oxidation and residual strain and suggests a viable path to track back wear-history information from the surface of UHMWPE, thus unfolding the in vivo kinematics of the bearing surfaces in hip joints on the microscopic scale.
机译：在超高分子量聚乙烯（UHMWPE）的模型纤维样品中，初步研究了A（g），B（1g），B（2g）和B（3g）模式的极化拉曼强度的角度依赖性。为了检索拉曼张量元素，即控制聚乙烯斜方晶结构振动行为的固有参数。基于这种拉曼分析，提出了一种确定正交晶体薄片取向分布函数的同时确定UHMWPE生物医学组件中未知晶体取向模式的方法。显示了该方法的应用，其中我们定量检查了四个体内暴露的UHMWPE髋臼杯与未使用的杯相比，在四个暴露于表面的分子取向图样。有趣的发现是：（i）在磨损的表面上观察到清晰的取向角双峰分布; （ii）在所有取出的髋臼杯中，在主要磨损区域与非磨损区域中，分子取向和结晶度均出现了明确而系统的增长。目前的晶体学分析是我们先前对UHMWPE髋臼杯的拉曼研究的扩展，该研究与评估氧化和残余应变有关，并提出了一条从UHMWPE表面追踪磨损历史信息的可行途径，从而揭示了UHMWPE髋臼杯的运动学微观尺度上髋关节的支撑表面。

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