一种新型椎间融合器用于腰椎融合的有限元模型建立  

Establishment of finite element model for lumbar interbody fusion using a new lumbar infusion cage

作　　者：马金梁[1] 李孝林[2] 邓忠良[1] 

机构地区：[1]重庆医科大学附属第二医院骨科,重庆400010 [2]湖北荆州长江大学医学院

出　　处：《上海医学》2012年第11期960-963,I0002,共5页Shanghai Medical Journal

基　　金：国家"863"计划(2008AA02Z443);重庆市卫生局科研基金(2011-1-053)资助项目

摘　　要：目的建立可被进一步作生物力学研究的部分可吸收型椎间融合器应用于腰椎融合的有限元模型。方法应用Mimics10.01、Geomagic、Ansys12.0软件建立正常人体L3～L4节段的有限元模型。应用Ansys12.0软件建立部分可吸收椎间融合器的有限元模型,并建立植入椎间融合器后的模型。施加400N垂直压缩载荷和10Nm扭矩载荷以模拟腰椎屈伸、侧弯及旋转运动,验证模型的有效性。模拟腰椎垂直压缩状态,提取模型应力图并做初步评估。结果快速建立外形逼真的部分可吸收型椎间融合器用于腰椎融合的有限元模型。有限元模型在加载同样的载荷后,前屈、后伸的运动范围(ROM)值分别为5.76°、3.19°,左、右侧屈的ROM值分别为5.08°、5.01°,左、右旋转的ROM值分别为1.78°、1.73°。椎体及椎间融合器应力分布均匀合宜,局部未见明显应力集中。结论所建模型可被进一步应用于相关生物力学研究。Objective To establish a finite element model of partially bioabsorbable interbody fusion cage （PBIFC） for future biomechanical property study. Methods A 3D finite element model of a normal L3 -L4 segment was constructed using Mimics 10.01, Geomagic and Ansys 12.0. Ansys 12.0 was used to establish the finite element model of the PBIFC, and the model of cage implantation was also established, An axial compressive preload of 400 N and a torsional moment of 10 Nm were applied to the L3 segment to simulate flexion, extension, rotation, and lateral bending of the lumbar segment. Lumbar compression state was also simulated and the stress cloud chart of model was extracted for preliminary evaluation. Results A lifelike finite element model of PBIFC was quickly established. Finite element analysis result showed that the range of motion of L3 - L4 segment was as following： flexion/extension, 5.76° and 3.19° left/right bending, 5.08°and 5.01°left/right rotation, 1.78°and 1.73°. Stress distribution of vertebral body and cage was even and acceptable, with no obvious stress concentration. Conclusion The model in the present study is accurate and effective, and can be used for further biomechanical analysis.

关 键 词：有限元模型 融合器 生物力学 椎间融合术 

分 类 号：R687.3[医药卫生—骨科学]