浙江医学2017，Vol.39Issue(10)：805-808,后插3,5.DOI:10.12056/j.issn.1006-2785.2017.39.10.2017-164
腰椎间孔成形幅度对腰椎生物力学影响的三维有限元分析
Lumbar biomechanical characteristics after foraminoplasty in different amplitudes： a finite element analysis
摘要
Abstract
Objective To analyze lumbar biomechanical characteristics after foraminoplasty in different amplitudes based on a three-dimensional finite element model of L3-5 segments of the lumbar spine.Methods A 20-year-old Chinese male volunteer who had no history of lumbar disease was selected.Using the obtained CT data,the three-dimensional model of L3～5 segment was established by Mimics15.0 software,and curved,repaired and denoised by Geomagic 12.0 software,the degeneration of L4-5(model M1) was simulated by modifying the material parameters of the nucleus pulposus and annulus fibrosus of intervertebral disc and grided by Hypermesh 12,and then was analyzed by ABAQUS software.The lumbar discectomy was simulated via percutaneous transforaminal endoscopic posterior approach to establish a channel between the midpoint of the tip of the protruding points and the top of the vertebral body,which removed the superior facet bone for foraminal plasty,the whole layer of middle of the fiber ring at the 1/4 right of the inter-vertebral and about a quarter of the nucleus pulposus to establish model M2.The model of the first-stage foraminoplasty (model M3,diameter 5mm),the second-stage foraminoplasty (model M4,diameter 6.5mm) and three-stage foraminoplasty (model M5,diameter 7.5mm) were established by using the cylinder instead of the trepan remove the superior facet bone for foraminoplasty.Under specific loading conditions,biomechanical characteristics of 6 kinds of loads (the forward bends,stretch,left and right side bend,rotate) were compared.Results An effective L3～5 three-dimensional finite element model was established.In addition to the displacement of the L4 vertebral body during extension,the forming of the lumbar intervertebral hole had no significant difference on the displacement of intervertebral lumbar.Different forming amplitude of intervertebral lumbar had no significant difference on the stress of the protruding joints.In the M1 model,the stress of the L4～5 left facet joints was larger than the right side under various conditions.In the M2 model,the stress L4～5 left facet joints decreased in lumbar flexion and dextral,the stress increased on the right side.The stress on the right side of L4～5 facet joints increased in left lumbar flexion,but decreased on the right lumbar flexion.In addition to the stress of the L4～5 right facet joint increased significantly,and the stress changes of L4～5 facet joints of M3,M4,M5 models were not significant under other working conditions.Conclusion Under the guidance of the precise puncture,the hole forming of grade 1 to grade 3 lumbar intervertebral hole has no significant effect on the stabilization of the lumbar and the stress distribution of the joints.关键词
腰椎/生物力学/椎间盘移位/应力/物理/有限元分析Key words
Lumbar vertebrae/Biomechanics/Intervertebral disk displacement/Stress/Mechanical/Finite element analysis analysis引用本文复制引用
阮朝阳,何永清,曾强华,朱群威,付强..腰椎间孔成形幅度对腰椎生物力学影响的三维有限元分析[J].浙江医学,2017,39(10):805-808,后插3,5.基金项目
浙江省医药卫生科技计划项目(2015KYB395) （2015KYB395）
