The effect of mixing technique on fatigue of bone cement when stress concentrations are present

被引：1
作者：
Hoey D. [1 ]
Taylor D. [1 ]
机构：
[1] Trinity Centre for Bioengineering, Trinity College
来源：
International Journal of Nano and Biomaterials | 2010年 / 3卷 / 01期
关键词：
Bone cement; Critical distance; Fatigue; Mixing technique; Stress concentration;
D O I：
10.1504/IJNBM.2010.036106
中图分类号：
学科分类号：
摘要：
Mixing techniques used to reduce porosity in bone cement demonstrate large improvements in fatigue behaviour in test specimens, but do not appear to reduce the rate of loosening of implants in vivo. We examined data showing the effect of notches on fatigue strength and found, surprisingly, that notches with low stress-concentration factors (Kt < 2.4) had no effect compared to unnotched specimens. Using the theory of critical distances (TCD) we found the characteristic fatigue strength of the porous material to be similar to the measured fatigue strength of pore-free material; the characteristic length (L) was similar to the average pore size. This allowed us to define a number of different cases, depending on the relative dimensions of the notch and the pores. We concluded that techniques which reduce porosity can be expected to improve fatigue life only in certain cases, which are frequently encountered in test specimens but only rarely occur in clinical situations. Copyright © 2010 Inderscience Enterprises Ltd.
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页码：36 / 48
页数：12
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