中国现代医学杂志2017，Vol.27Issue(7)：72-79,8.DOI:10.3969/j.issn.1005-8982.2017.07.017
胸腰椎骨折术后伤椎上终板骨缺损的生物力学有限元分析
Biomechanical stability finite element analysis of injured vertebrae with superior endplate bone defect after thoracolumbar fracture surgery
王鹏 1王静成 1冯新民 1杨建东 1陶玉平 1张志强1
作者信息
- 1. 扬州大学临床医学院苏北人民医院 脊柱外科,江苏 扬州 225001
- 折叠
摘要
Abstract
Objective To evaluate whether the condition of the patients is suitable for removal of the internal fixation using biomechanical finite element analysis in the patients complicated with superior endplate bone defect of injured vertebrae after thoracolumbar fracture surgery. Methods A healthy male volunteer was chosen after exclusion of spinal bone deformities, injury or other lesions by imaging examination. The thin slice images of T11-L2 were extracted using 64 row spiral CT. The data were put into Mimics 15.0 software to establish a 3-dimensional finite element model of T11-L2 vertebrae which contained 3-dimensional surface element but excluded entity. Further entity model was set up using SolidWorks software, which could retain the original spatial relations and build the model directly, generate mesh and establish intervertebral disc, ligament and other structures. The value was assigned to the model and tested. The pedicle screw-rod system was inserted in the model and the models containing 5 different volume (1/5, 2/5, 3/5, 4/5 and 5/5 of anterior vertebral column) of bone defect were derived out and a biomechanical analysis was made on this basis. Results With the increase of bone defect after removal of implants, the group E (4/5 to 5/5 volume of anterior vertebral column) had the biggest amplification of the total stress about the 7 kinds of operating modes. When the bone defect volume reached 4/5 of anterior vertebral column, stress concentration increased significantly, indicating the risks of vertebral compress and even fracture were greatly increased after removing the internal fixation at this moment. Conclusions We hold the opinion that if the superior endplate bone defect of the injured vertebrae reaches 4/5 of anterior vertebral column, careful consideration should be given to the removal of internal fixator in order to avoid vertebral refracture.关键词
胸腰椎骨折/终板塌陷/骨缺损/有限元分析Key words
thoracolumbar fracture/collapse of the endplate/bone defect/finite element analysis分类
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王鹏,王静成,冯新民,杨建东,陶玉平,张志强..胸腰椎骨折术后伤椎上终板骨缺损的生物力学有限元分析[J].中国现代医学杂志,2017,27(7):72-79,8.
