摘要
我们从生物力学的角度出发 ,将骨自优化理论和非线性有限元法相结合 ,研究了骨 假体界面间隙及摩擦系数对假体周围骨再造的影响。研究表明界面间隙的大小对假体周围骨再造起着至关重要的作用。从动物实验和临床中我们可以观察到 ,假体周围再造的小梁骨的结构是可以变化的。一种是在假体周围有环绕假体的骨性结构 ,骨小梁如辐条状与这种骨结构相连而形成的有轴心辐条结构 ;另一种是在假体周围没有骨性结构 ,骨小梁直接与假体相连而形成的无轴心辐条结构。结果表明 ,在完全固定的边界条件下 ,会产生无轴心的辐条结构 ;在有间隙或滑动的边界条件下 ,会产生有轴心的辐条结构。在特定的生理条件下 ,轴心的厚度取决于骨 假体界面间隙值的大小 ,而与摩擦系数无关。
The effect of the friction coefficient and interface gap between the bone and prosthesis on bone remodeling around the prosthesis was studied by combining nonlinear FEA with self-optimized bone remodeling theory. The structure of the trabecula could vary on the basis of observation of the animal experiments and clinical situation. One is that there is bony structure around the prosthesis, the trabecula contact with this bony structure like 'spoke with hub'; the other is that there isn′t bony structure around the prosthesis, the trabecula contact directly with the prosthesis like 'spoke without hub'. The result showed that the spoke without hub structure will be created on the perfect bonding boundary condition, the spoke with hub structure will be created on the specified gap or roller boundary condition. The width of the hub depends on the width of the gap between the bone and prosthesis, not depend on the friction coefficient.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
2002年第6期493-500,共8页
Chinese Journal of Biomedical Engineering
基金
国家自然科学基金资助项目 ( 39970 191)
吉林省科技发展计划项目 ( 19980 5 5 4 -0 1)
