摘要
目的基于三维有限元建模方法,建立腰椎弓根动态稳定钉棒系统的模型,初步分析处于不同载荷下腰椎的应力分布及各节段的活动度。方法对一名健康成年男性志愿者行CT扫描,用Mimics 10.01、Abaqus6.10软件建立正常人L3～S2节段模型。结合Bioflex动态稳定系统建立模型。对模型施加150 N预载荷,在3个主平面施加10 Nm扭矩,获得前屈、后伸、侧屈及旋转6种运动状态下的Bioflex钉棒应力分布和各节段的椎间活动度,初步测定后伸及旋转运动的活动度。结果建立的腰椎L3～S2节段和动态稳定系统有限元模型符合生物力学模型,初步分析显示腰椎动态稳定系统的应力主要集中于螺旋固定棒;在各种加载下,腰椎动态固定的节段活动度明显降低。结论基于三维有限元方法建立的Bioflex腰椎弓动态固定模型能很好地模拟腰椎的动态固定力学活动,可以对固定后的腰椎的应力和各种活动进行很好的模拟,具有很好的研究价值。
Objective To construct the dynamic lumbar pedicle scree system based on the three-dimensional finite element model,thus to preliminarily analyze the stress distribution under different loads and the range of motion（ ROM）.Methods CT scan of the L3～ S2 section of a healthy adult male volunteer was performed,while Mimics 10.01 and Abaqus 6.10 software were introduced to establish normal segmental model.Bioflex pedicle screw and elastic rod were used to establish dynamic stability system model.Under 150 N preload,and 10 Nm torque to three principal planes,the stress distribution in flexion,extension,lateral bending and torsion were simulated,while the ROMs of extension and torsion were also analyzed.Results The establishment of a lumbar L3～ S2 segmental finite element model and the dynamic stability system conformed to biomechanical model.Stress mainly concentrated on the elastic rods,when preliminarily analyzing dynamic stabilization system of the lumbar spine.Under the extension and rotation loads,the ROMs of implanted segments were significantly reduced.Conclusion Based on the three-dimensional finite element method,the established Bioflex lumbar dynamic model can excellently simulate the mechanical activity of the lumbar spine dynamic system;also simulate the stress of the lumbar spine and all kinds of activities,proved to valuable.
出处
《广东医学》
CAS
北大核心
2015年第10期1497-1500,共4页
Guangdong Medical Journal
基金
广东省医学科研基金资助课题(编号:A2014147)
关键词
腰椎
动态稳定系统
椎弓根钉
有限元分析
lumbar
dynamic stability system
pedicle screw
finite element analysis
