Finite element analysis on scoliosis lumbosacral vertebral structure and its deformation trend
10.16156/j.1004-7220.2017.03.005
- VernacularTitle:脊柱侧凸腰骶椎结构的有限元分析及其变形趋势
- Author:
Shao-Wei JIA
1
;
Shun-Xin ZHANG
;
Shun-Cheng FAN
;
Ye LI
;
Xiao-Dan WU
;
Jun-De XIE
;
Li HAN
Author Information
1. 河北工业大学机械学院
- Keywords:
Scoliosis;
Lumbosacral vertebra;
Finite element analysis;
Deformation trend;
Lenke classification
- From:
Journal of Medical Biomechanics
2017;32(3):235-241
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the correlation between the deformation and displacement trend of the lumbosacral vertebra (L1-S1) for two typical scoliosis spines under vertical loads,so as to provide the mechanical basis of treatment and prevention of scoliosis in clinic.Methods The X-ray computed tomography (CT) images of two typical scoliosis spines (Lenke-4AN type and Lenke-5CN type) were converted into 3D models,and their finite element models were then established and verified.The internal stress distribution and displacement variation of the models were calculated by the finite element software;the correlation between the lumbosacral vertebral structure and displacement of the spine was analyzed.Results Under the same boundary conditions and load cases,the stress and displacement for two kinds of lumbosacral vertebral models showed different trends.Due to its leftleaning and forward convex bending deformation as well as the relatively large lordosis angle (60°) and smaller left-leaning angle (17.37°),the Lenke-4AN type lumbosacral spine produced slightly small forward convex displacement (8.18 mm) and relatively large left-leaning displacement (0.97 mm).The Lenke-5CN type lumbosacral spine showed left-leaning and forward convex bending deformation as well,with relatively large lordosis angle(59°) and left-leaning angle (26.97°),so it produced more severe left-leaning displacement (20.65 mm) andforward convex displacement (9.22 mm).Conclusions The deformation trend of lumbosacral vertebra is closelyrelated to its structural characteristics,and different scoliosis lumbosacral vertebral structures will cause the corre-sponding deformation trend.The research findings are important for the prevention and treatment of scoliosis.
