Effect of femoral head size on the wear of metal on metal bearings in total hip replacements under adverse edge-loading conditions.
Effect of femoral head size on the wear of metal on metal bearings in total hip replacements under adverse edge-loading conditions.
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DOI：
10.1002/jbm.b.32824
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发表时间：
2013-02
影响因子：
3.4
通讯作者：
Jennings, Louise M.
中科院分区：
文献类型：
--
作者：
Al-Hajjar, Mazen;Fisher, John;Williams, Sophie;Tipper, Joanne L.;Jennings, Louise M.
金属对金属（MoM）轴承在标准髋关节模拟器条件下显示出低磨损率；然而，回收研究表明，磨损率和机制存在很大差异。体内高磨损会导致灾难性的并发症，并与大的杯倾角（旋转错位）有关。然而，在体外增加杯倾角并没有复制磨损的增加到与在取出物中观察到的相同程度。当微分离（平移错位）条件引入步态周期时，在体外观察陶瓷对陶瓷轴承的临床相关磨损率、模式和颗粒。在本研究中，在不利条件下研究了28和36毫米MoM轴承。将杯角从45°增加到65°导致28 mm轴承的磨损率显着增加。然而，对于36 mm轴承，在陡杯角条件下，头缘接触没有发生，磨损率没有增加。在步态周期中引入微分离显着增加了MoM轴承的磨损率。在微分离条件下，杯角和封头尺寸对磨损率没有影响。该研究表明，高体内磨损率与由于旋转错位造成的边缘负荷有关，如高杯倾角和易动错位，这些可能是由于多种手术因素造成的。平动错位对磨损率的影响更为显著。临床前模拟测试应在平移和旋转错位条件下进行，以及ISO标准定义的标准步行周期条件下进行。©2012 Wiley期刊公司[J]中国生物医学工程学报，2013。
Metal-on-metal (MoM) bearings have shown low-wear rates under standard hip simulator conditions; however, retrieval studies have shown large variations in wear rates and mechanisms. High-wear in vivo has caused catastrophic complications and has been associated with steep cup-inclination angle (rotational malpositioning). However, increasing the cup-inclination angle in vitro has not replicated the increases in wear to the same extent as those observed in retrievals. Clinically relevant wear rates, patterns, and particles were observed in vitro for ceramic-on-ceramic bearings when microseparation (translational malpositioning) conditions were introduced into the gait cycle. In the present study, 28 and 36-mm MoM bearings were investigated under adverse conditions. Increasing the cup angle from 45° to 65° resulted in a significant increase in the wear rate of the 28 mm bearings. However, for the 36 mm bearings, head-rim contact did not occur under the steep cup-angle condition, and the wear rate did not increase. The introduction of microseparation to the gait cycle significantly increased the wear rate of the MoM bearings. Cup angle and head size did not influence the wear rate under microseparation conditions. This study indicated that high-in vivo wear rates were associated with edge loading due to rotational malpositioning such as high-cup-inclination angle and translational malpositioning that could occur due to several surgical factors. Translational malpositioning had a more dominant effect on the wear rate. Preclinical simulation testing should be undertaken with translational and rotational malpositioning conditions as well as standard walking cycle conditions defined by the ISO standard. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2013.
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DOI：
10.1243/0954411011533481
发表时间：
2001-01-01
影响因子：
1.8
作者：
Firkins, PJ;Tipper, JL;Fisher, J
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Fisher, J
影响因子：
3.5
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DOI：
10.1302/0301-620x.77b6.7593096
发表时间：
1995-11-01
影响因子：
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MCGRORY, BJ;MORREY, BF;CABANELA, ME
通讯作者：
CABANELA, ME
影响因子：
3.5
作者：
Jolles, BM;Zangger, P;Leyvraz, PF
通讯作者：
Leyvraz, PF
DOI：
10.1302/0301-620x.91b6.21682
发表时间：
2009-06-01
影响因子：
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作者：
Hart, A. J.;Sabah, S.;Skinner, J. A.
通讯作者：
Skinner, J. A.