摘要
目的：了解正常人腰椎椎体的应力分布特点。方法：采用ＱＣＴ扫描一正常志愿者的Ｌ１椎体，依据Ｌ１椎体的ＣＴ片以Ａｌｇｏｒ的ＦＥＡＳ有限元分析系统逐层几何形重建，并按照骨窗灰度适当划分单元，建立Ｌ１的３１２８个结点，２１８８个块单元的三维有限元模型。各单元材料特性依据校正后的ＣＴ值－表观密度－弹性模量间的换算关系进行计算，共采用了２００种弹性材料，进行８００Ｎ轴向加载，进行应力分布计算。结果：应力集中的部位有小关节、椎弓根、上下终板中部及椎体的侧后壁下缘；骨松质椎体中部略偏后方和上下终板附近应力水平较高，高应力区呈三维“工”形结构。结论：正常人腰椎椎体的应力分布与解剖学结构具有一致性。
Objective: To realize normal stress distribution of lumbar vertebral body. Methods: L1 vertebrae of a volunteer was scanned with QCT, and based on its images, a 3 Results: Stress concentrates at facet joints, pedicles, central part of end plates and the posteriorlateral margin of vertebral body, a relatively high stress region within cancellous bone made up an “I” shape which contained the areas around both end plates and the central part of vertebral body. Conclusion:Stress distribution of lumbar vertebral body is in coincidende with its anatomy.
出处
《第二军医大学学报》
CAS
CSCD
北大核心
1997年第6期566-568,共3页
Academic Journal of Second Military Medical University
基金
上海市科委八五科技攻关课题
