Harsha A P, Joyce Tom J
Department of Mechanical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh, India.
Proc Inst Mech Eng H. 2013 May;227(5):600-8. doi: 10.1177/0954411913479528. Epub 2013 Mar 6.
Wear particle-induced osteolysis is a major concern in hip implant failure. Therefore, recent research work has focussed on wear-resistant materials, one of the most important of which is cross-linked polyethylene. In view of this, the objective of this study was to compare the in vitro wear performance of cross-linked polyethylene to traditional ultra-high molecular weight polyethylene. In order to mimic appropriate in vivo conditions, a novel high-capacity wear tester called a circularly translating pin-on-disc was used. The results of this in vitro study demonstrated that the wear rate for cross-linked polyethylene was about 80% lower than that of conventional ultra-high molecular weight polyethylene. This difference closely matches in vivo results reported in the literature for total hip replacements that use the two biopolymers. The in vitro results were also verified against ASTM F732-00 (standard test method for wear testing of polymeric materials for use in total joint prostheses). The 50-station circularly translating pin-on-disc proved to be a reliable device for in vitro wear studies of orthopaedic biopolymers.
磨损颗粒诱导的骨溶解是髋关节植入物失效的一个主要问题。因此，最近的研究工作集中在耐磨材料上，其中最重要的一种是交联聚乙烯。鉴于此，本研究的目的是比较交联聚乙烯与传统超高分子量聚乙烯的体外磨损性能。为了模拟合适的体内条件，使用了一种新型的高容量磨损测试仪，称为循环平移销盘式磨损测试仪。这项体外研究的结果表明，交联聚乙烯的磨损率比传统超高分子量聚乙烯低约80%。这种差异与文献中报道的使用这两种生物聚合物的全髋关节置换术的体内结果非常吻合。体外结果也根据ASTM F732-00（用于全关节假体的聚合材料磨损测试的标准测试方法）进行了验证。50工位循环平移销盘式磨损测试仪被证明是用于骨科生物聚合物体外磨损研究的可靠装置。
