Contact stresses in lumbar total disc arthroplasty

被引：0
|
作者：
Wenzel, S. A. [1 ]
Shepherd, D. E. T. [1 ]
机构：
[1] Univ Birmingham, Dept Mech & Mfg Engn, Birmingham B15 2TT, W Midlands, England
来源：
BIO-MEDICAL MATERIALS AND ENGINEERING | 2007年 / 17卷 / 03期
关键词：
cobalt chrome molybdenum alloy; disc arthroplasty; Hertzian; stress; ultra high molecular weight polyethylene;
D O I：
暂无
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
Total disc arthroplasty is gaining in popularity as an alternative to spinal fusion. A total disc consists of articulating bearing surfaces with one made from a metal and the other made from either a metal or a polymer. The aim of this study was to determine the contact stresses in lumbar total disc arthroplasty devices. The total disc was modelled as a ball and socket joint and Hertzian contact theory was used to determine the maximum contact stresses. The effect of material combination and implant size on contact stress was investigated. For a typical disc arthroplasty with a ball radius of 14 mm, the contact stresses for metal against polymer and metal against metal material combinations were 3 to 6 MPa and 63-130 MPa, respectively, and were below the fatigue strength of the materials.
引用
收藏
页码：169 / 173
页数：5
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