The effect of insert conformity and material on total knee replacement wear.
The effect of insert conformity and material on total knee replacement wear.
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DOI：
10.1177/0954411913513251
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发表时间：
2014-01
期刊：
影响因子：
--
通讯作者：
Fisher J
中科院分区：
文献类型：
--
作者：
Abdelgaied A;Brockett CL;Liu F;Jennings LM;Jin Z;Fisher J
平均寿命正在增加;因此，需要增加假体的寿命。为了满足这一要求，正在采用新的假肢设计和材料。可能影响全膝关节置换术磨损以及预期寿命的两个设计参数是衬垫贴合性和材料。计算模型已广泛用于人工膝关节设计的磨损预测和优化。本研究的目的是使用先前确认的基于无量纲磨损系数的计算磨损模型来研究衬垫贴合性和材料对全膝关节置换术中预测磨损的影响。在两种不同运动学输入（中等和高）下，对具有不同贴合度的四种不同衬垫（弯曲型、唇缘型、部分平坦型和定制平坦型）与相同股骨部件进行了测试，并采用不同水平的交叉剪切。衬垫关节面材料为传统或中度交联超高分子量聚乙烯（UHMWPE）。根据利兹膝关节模拟测试的实验数据对磨损预测进行了验证。弯曲型胫骨衬垫（最贴合）的预测磨损率是平坦型胫骨衬垫（最贴合）的三倍以上。此外，中度交联UHMWPE关节面的计算预测平均体积磨损率不到其相应传统UHMWPE关节面的一半。此外，与传统UHMWPE相比，中度交联UHMWPE的磨损对交叉剪切程度的依赖性较小。这些结果沿着支持性实验研究提供了对设计变量的深入了解，这可能会减少膝关节置换术中的磨损。
The mean average life is increasing; therefore, there is a need to increase the lifetime of the prostheses. To fulfil this requirement, new prosthetic designs and materials are being introduced. Two of the design parameters that may affect wear of total knee replacements, and hence the expected lifetime, are the insert conformity and material. Computational models have been used extensively for wear prediction and optimisation of artificial knee designs. The objective of the present study was to use a previously validated non-dimensional wear coefficient-based computational wear model to investigate the effect of insert conformity and material on the predicted wear in total knee replacements. Four different inserts (curved, lipped, partial flat and custom flat), with different conformity levels, were tested against the same femoral and under two different kinematic inputs (intermediate and high), with different levels of cross-shear. The insert bearing materials were either conventional or moderately cross-linked ultra-high molecular weight polyethylene (UHMWPE). Wear predictions were validated against the experimental data from Leeds knee simulation tests. The predicted wear rates for the curved insert (most conformed) were more than three times those for the flat insert (least conformed). In addition, the computationally predicted average volumetric wear rates for moderately cross-linked UHMWPE bearings were less than half of their corresponding conventional UHMWPE bearings. Moreover, the wear of the moderately cross-linked UHMWPE was shown to be less dependent on the degree of cross-shear, compared to conventional UHMWPE. These results along with supporting experimental studies provide insight into the design variables, which may reduce wear in knee replacements.
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影响因子：
2.4
作者：
Godest, AC;Beaugonin, M;Gregson, PJ
通讯作者：
Gregson, PJ
DOI：
10.2106/00004623-198668070-00010
发表时间：
1986-09-01
影响因子：
5.3
作者：
BARTEL, DL;BICKNELL, VL;WRIGHT, TM
通讯作者：
WRIGHT, TM
DOI：
10.1177/0954411912445265
发表时间：
2012-01-01
影响因子：
1.8
作者：
Brockett, Claire L.;Jennings, Louise M.;Fisher, John
通讯作者：
Fisher, John
影响因子：
4.2
作者：
Berry, Daniel J.;Currier, John H.;Collier, John P.
通讯作者：
Collier, John P.
影响因子：
4.2
作者：
Fisher, John;Jennings, Louise M.;Ingham, Eileen
通讯作者：
Ingham, Eileen