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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Edge loading does not increase wear rates of ceramic-on-ceramic and metal-on-polyethylene articulations
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Edge loading does not increase wear rates of ceramic-on-ceramic and metal-on-polyethylene articulations

机译：边缘载荷不会增加陶瓷-陶瓷和金属-聚乙烯铰接的磨损率

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The mal-positioning of total hip arthroplasty components can result in edge loading conditions. Purpose of this study was to determine if the wear rate of ceramic-on-ceramic and metal-on-polyethylene increases under edge loading conditions. The literature was reviewed to determine which of the commonly used hip bearings is the most forgiving to implant mal-orientation. Two 28-mm ceramic-on-ceramic articulations were tested in vitro: pure alumina (PAL) ceramic versus the new alumina-toughened zirconia (ATZ). Two 28-mm metal-on-polyethylene articulations were tested in vitro: conventional ultrahigh molecular weight polyethylene (UHMWPE) versus highly crosslinked polyethylene (HXLPE) stabilized with vitamin E. All bearings were tested at standard and at highest possible inclination angles. Hip simulator tests were run for five million cycles based on N=3 tests per condition. The average wear rate of ATZ-on-ATZ is 0.024 mm(3)/Mcycles at 45 degrees and 0.018 mm(3)/Mcycles at 65 degrees. Wear rate of PAL-on-PAL is between 0.02 and 0.03 mm(3)/Mcycles at 45 degrees, as well as 65 degrees. The wear rate of UHMWPE was 31 1 mm(3)/Mcycles at an inclination angle of 45 degrees and 26 +/- 1 mm(3)/Mcycles at 80 degrees. The wear rate of vitamin E stabilized HXLPE was 5.9 +/- 0.2 mm(3)/Mcycles at 45 degrees and 5.8 +/- 0.2 mm(3)/Mcycles at 80 degrees. Edge loading does not increase the wear rate of ceramic-on-ceramic and metal-on-polyethylene articulations. The newest biomaterials showed markedly lower wear rates compared with their conventional counterparts. ATZ-on-ATZ showed the lowest wear rate of all tested pairings, but the vitamin E stabilized HXLPE seems to be the most forgiving material when it comes to implant mal-orientation. (C) 2014 Wiley Periodicals, Inc.
机译：全髋关节置换组件的位置不正确会导致边缘负荷情况。这项研究的目的是确定在边缘载荷条件下陶瓷对陶瓷和聚乙烯对金属的磨损率是否增加。回顾文献以确定哪种最常用的髋关节轴承最能容忍植入物的方向错误。在体外测试了两种28mm的陶瓷-陶瓷连接：纯氧化铝（PAL）陶瓷与新型氧化铝增韧氧化锆（ATZ）。在体外测试了两个28毫米金属对聚乙烯的铰接：用维生素E稳定的常规超高分子量聚乙烯（UHMWPE）与高交联聚乙烯（HXLPE）。所有轴承均在标准和最大可能倾斜角下进行了测试。根据每个条件的N = 3个测试，髋关节模拟器测试进行了500万个循环。 ATZ-on-ATZ的平均磨损率在45度时为0.024 mm（3）/ Mcycles，在65度时为0.018 mm（3）/ Mcycles。 PAL-on-PAL的磨损率在45度和65度之间为0.02至0.03 mm（3）/ Mcycles。 UHMWPE的磨损率在45度倾斜角下为31 1 mm（3）/ Mcycles，在80度下为26 +/- 1 mm（3）/ Mcycles。维生素E稳定的HXLPE在45度时的磨损率为5.9 +/- 0.2 mm（3）/ Mcycles，在80度时为5.8 +/- 0.2 mm（3）/ Mcycles。边缘载荷不会增加陶瓷-陶瓷和金属-聚乙烯铰接的磨损率。最新的生物材料与传统材料相比，磨损率明显降低。在所有测试的配对中，ATZ-on-ATZ的磨损率最低，但是，对于植入物取向不良，维生素E稳定的HXLPE似乎是最宽容的材料。 （C）2014威利期刊公司

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