各向异性松质骨弹性性能有限元分析

Finite Element Analysis of Mechanical Properties for Anisotropic Cancellous Bone

骨质疏松会导致松质骨细化从而降低松质骨力学性能。为了评估椎体松质骨的力学特性,文中采用有限元参数化建模,利用十四面体模型模拟棒状小梁骨的微结构,对各向异性松质骨的弹性性能进行了计算分析。通过控制输入参数Tb.Th、Tb.Sp、E0模拟不同骨质疏松程度的松质骨。计算结果表明,松质骨模量与骨体积分数呈平方律关系;随着各向异性比的增加,松质骨纵、横向模量间的比值呈线性增加,而横向两个模量保持基本一致。结果说明该微结构模型较好地反映了松质骨的横观各向同性性质,并能较好地反映受载松质骨的应力分布。

Osteoporosis causes the thinning of cancellous bone which reduces the mechanical properties of cancellous bone. In order to assess the compressive mechanical properties of vertebral cancellous bone, we developed a finite element parametric model of rod-like trabecular architecture. By inputting the apparent morphological parameters, Tb. Th, Tb. Sp and Eo, we simulates the anisotropic properties of cancellous bone. The result indicated that the relationship between modulus and BV/TV was square. The relationship between ratio of different directional modulus and anisotropic ratio was linear. It is illuminated that the model proposed could represent the transversely isotropic properties of cancellous bone and represent the stress distribution very well.