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。
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 es- tablished 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 nonarc vertebrae screws can yield good correction at least in finite element model.
出处
《中国脊柱脊髓杂志》
CAS
CSCD
北大核心
2010年第11期895-897,共3页
Chinese Journal of Spine and Spinal Cord
关键词
脊柱侧凸
生物力学
有限元分析
Spine scoliosis
Biomechanics
Finite element analysis.
