摘要
目的利用螺旋CT建立颈椎椎体次全切除减压植骨固定的三维有限元模型的高度数字化方法,为研究颈椎减压手术的生物力学实验提供标准模型。方法对健康成年男性志愿者进行CT扫描,获得C4～C7节段的断层图片,将数据保存为Dicom格式,导入Mimics9.1软件进行三维几何模型重建,形成三维图像,利用Freeform软件进行模型修改和表面划分,以IGES格式转入有限元软件Ansys9.0完成颈椎骨性模型的建立。利用有限元软件Ansys9.0,在颈椎骨性模型的基础上,补建终板、补充建立终板、椎间盘、髓核、前纵韧带、后纵韧带、黄韧带、棘间韧带、棘上韧带等结构。然后模拟颈椎椎体次全切除,将C5椎体、前纵韧带、上下椎间盘切除,将建立的钛网、钢板实体模型添加到减压区。采用合适的材料性质和实体单元类型对模型进行有限元网格划分。结果颈椎脊柱三维模型有限元网格划分结果:利用三维重建软件Mimics和有限元软件Ansys9.0,成功进行椎体次全切除减压钛网植骨钢板固定三维模型有限元网格划分。整个模型共有138995个节点和94039个单元,建成后的三维有限元模型与实体组织具有良好的几何相似性。结论建立的椎体次全切除植骨固定手术三维有限元模型接近真实的生物力学标本,可以进行临床和实验研究。
Objective To investigate the high digital method of three-dimensional finite element model for the lower cervical spine with titanium mesh cage and plate after anterior cervical osteotomy corpectomy by spiral CT, so as to provide standard model for biomechanical experiment for anterior cervical osteotomy corpectomy. Method The lower cervical spine（C4-CT） geometries were determined by CT images from a 23 year old healthy man. The finite element model was constructed by the combination of software Mimics 9.1 and Freeform. The meshed model was acquired and finished with Ansys 9.0. With the pretreatment function of finite el- ement software Ansys, the structure of lamina terminals, intervertebral discs, nucleus pulpous, anterior longitudinal ligaments, sup-raspinal ligament were established supplementarily based on the osseous structure of spinal model. Based on the intact finite element model（FE/Intact）, the model were generated by simulating anterior cervical titanium mesh fusion cage and plate after C5 corpectomy. Proper material features and entity unit type were used for intellectual finite element mesh division. Result Finite element mesh division of three-dimensional model of the lower cervical spine with titanium mesh cage and plate after anterior cervical corpectomy： Three-dimensional reconstructed software Mimics and finite soft：ware Ansys were used successfully to perform finite element mesh division of three-dimensional model of the lower cervical spine with titanium mesh cage and plate after anterior cervical corpectomy. Conclusions The constructed three-dimensional finite element model of the lower cervical spine with titanium mesh cage and plate after anterior cervical corpectomy approaches to real biomechanical sample, which can simulate the natural condition and facililate the further biomechanical research.
出处
《医用生物力学》
EI
CAS
CSCD
2009年第3期183-188,共6页
Journal of Medical Biomechanics
基金
泉州市优秀人才专项经费资助项目(项目编号:07A20)
泉州市科技局资助项目(项目编号:2006Z29)
关键词
颈椎
椎体次全切除
钛网
生物力学
有限元分析
网格生成
Cervical spine
Corpectomy
, Titanium mesh cage
Biomechanics
Finite elememt analysis
Mesh generation
