Effect of conformity and contact stress on wear in fixed-bearing total knee prostheses

被引：75

作者：

Galvin, Alison L. ^{[1
]}

Kang, Lu ^{[1
]}

Udofia, Itoro ^{[1
]}

Jennings, Louise M. ^{[1
]}

McEwen, Hannah M. J. ^{[2
]}

Jin, Zhongmin ^{[1
]}

Fisher, John ^{[1
]}

机构：

[1] Univ Leeds, Sch Mech Engn, Inst Med & Biol Engn, Leeds LS2 9JT, W Yorkshire, England

[2] DePuy Int Ltd, Leeds, W Yorkshire, England

来源：

JOURNAL OF BIOMECHANICS | 2009年 / 42卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

Total knee replacement; Polyethylene wear; MOLECULAR-WEIGHT POLYETHYLENE; TOTAL JOINT REPLACEMENTS; TIBIAL COMPONENTS; PRESSURE PREDICTION; DELAMINATION; KINEMATICS; UHMWPE; DESIGN;

D O I：

10.1016/j.jbiomech.2009.05.010

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

Ultra high molecular weight polyethylene (PE) remains the primary bearing surface of choice in total knee replacements (TKR). Wear is controlled by levels of cross-shear motion and contact stress. The aim of this study was to compare the wear of fixed-bearing total knee replacements with curved and flat inserts and to test the hypothesis that the flat inserts which give higher contact stresses and smaller contact areas would lead to lower levels of surface wear. A low-conforming, high contact stress knee with a low-medium level of cross shear resulted in significantly lower wear rates in comparison to a standard cruciate sacrificing fixed-bearing knee. The low wear solution found in the knee simulator was supported by fundamental studies of wear as a function of pressure and cross shear in the pin on plate system. Current designs of fixed-bearing knees do not offer this low wear solution due to their medium cross shear, moderate conformity and medium contact stress. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1898 / 1902

页数：5

共 26 条

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