韦 兴,胡明涛,史亚民,侯树勋,冯西桥.腰椎侧凸螺钉内固定节段对手术矫正效果影响的有限元分析[J].中国脊柱脊髓杂志,2010,20(11):895-897. |
腰椎侧凸螺钉内固定节段对手术矫正效果影响的有限元分析 |
中文关键词: 脊柱侧凸 生物力学 有限元分析 |
中文摘要: |
【摘要】 目的:应用有限元分析的方法,模拟腰椎侧凸矫形手术,探讨内固定螺钉位置对脊柱侧凸矫形的效果。方法:利用Simpleware软件建立L1~L5侧凸的三维有限元模型,侧凸角40°。在此模型上设计6组(A~F组)凹侧椎弓根螺钉置入计划,其中A-E 组为5个椎体依次空缺1个螺钉,F组作为对照行5个椎体置钉,连接矫形棒。应用ANSYS和ADAMS软件,计算矫形过程中反旋转和回弹时置入物所受载荷(最大扭矩及最大拔出力)以及脊椎的应力应变场。结果:6组矫形结束后的侧凸角分别为30°、23°、25°、22°、29°、21°。所需最大扭矩分别为3.1N·m、3.3N·m、4.6N·m、3.4N·m、4.2N·m和3.3N·m。螺钉所承受最大拔出力分别为418N、383N、437N、395N、420N和380N。结论:在保持一定固定范围条件下,间断减少非弧顶固定螺钉,在三维有限元模型上可得到较好的矫形效果。 |
The effect of instrument segments on the correction rate of lumbar scoliosis,a finite element analysis |
英文关键词:Spine scoliosis Biomechanics Finite element analysis. |
英文摘要: |
【Abstract】 Objective:To simulate the correction surgery of lumbar scoliosis by finite element analysis and investigate the effect of instrument segments on the correction rate of lumbar scoliosis.Method:A detailed three-dimensional finite element scoliotic model of L1-L5 with a Cobb angle of 40°on sagittal plane was established by using Simpleware software.Six types(group A-F)of pedicle screw instrumentations on concave side were designed on the model(of these,uniscrew placement in each vertebral body of group A-E,while biscrew placement in each vertebral body of group F).The spinal stress and strain field during with respect to anti-rotation and the rebound in the process of correction were meassured by using software ANSYS and ADAMS software.Result:The scoliostic angle after correction was 30°,23°,25°,22°,29°and 21°respectively for group A to E.The maximum torque was 3.1N·m,3.3N·m,4.6N·m,3.4N·m,4.2N·m and 3.3N·m,the maximum pull out force was 418N,383N,437N,395N,420N and 380N.Conclusion:Under definite circumstances,decreasing non-arc vertebrae screws can yield good correction at least in finite element model. |
投稿时间:2010-05-25 修订日期:2010-08-17 |
DOI:10.3969/j.issn.1004-406X.2010.[issue].895.2 |
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