摘要
采用骨再造理论和有限元相结合的方法，用计算机模拟钢板植入后骨的再造行为，从而定量的分析了钢板对骨的应力遮挡效应。骨再造理论采用Ｃｏｗｉｎ应变适应性弹性理论，有限单元采用八节点六面体等参数单元。结果表明，由于钢板对骨的应力遮挡，股骨发生了明显的骨吸收。钢板侧比对侧骨吸收严重，板中央的骨截面，比两端的骨截面吸收严重。板中央的骨截面吸收最大，截面面积吸收率Ψ达到３２．５％，抗弯截面模量损失率ζ达到２２．６％。目前大家常用的应力遮挡率η只能表示植入物对骨的一点处的应力遮挡程度，不能直接反映应力遮挡效应。我们提出两个新量骨截面面积吸收率Ψ和抗弯截面模量损失率ζ，用以度量植入物对骨的应力遮挡效应。
Using theory of bone remodeling together with finite element method, computer simulation of femur face remodeling was made after TFTCP implanation in order to analyse quantitatively the effect of stress shield of the plate. The theory of remodeling was based on Cowins theory of elasticity of strain adaptation and adopted three dimensional eight noded isoparametric element. As a results, an obvious bone resorption of the femur was observed due to the effect of stress shield of the plate implanted. The resorption at the plate side was more obvious than that of the opposite side, and the bone resorption in the middle portion of the plate was also more obvious than that of both ends. The resorption rate( Ψ ) of the cross section area was 32.5%, and the loss rate ( ζ ) of cross section modulus was 22.6%. Thus, Ψ and ζ are first proposed to describe the effect of stress shield of the palte. So, these two new variables could reflect the final outcome of stress shield more directly than stress shield rate η at a certain point could.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
1997年第2期128-132,166,共6页
Chinese Journal of Biomedical Engineering
基金
吉林省科委资金资助
国家自然科学基金
关键词
骨再造模拟
应力遮挡
加压钢板
截面吸收率
Stress shield
Simulation of bone remodeling
Trihedral Fix Trough Compression Plate
Loss rate of cross section modulus
Resorption rate of cross section area
