椎骨胸腰节段压缩骨折的有限元分析研究

发布时间：2018-05-19 14:26

本文选题：胸腰椎 + 有限元分析　；参考：《中国现代医学杂志》2017年22期

【摘要】：目的利用有限元方法建立椎体前缘不同压缩状态模型,并分析椎体前缘压缩程度与邻椎终板应力的相关性。方法基于正常成年人志愿者的胸腰段CT数据,导入Mimics,经图像分割、修补及三维网格化获取胸腰椎T11~L13个节段数据,网格赋材质属性后导入ABAQUS软件,获取逼真的三维有限元模型。对模型进行生理载荷加载,验证正常模型的有效性。将L1模型底部全自由度固定,在T11模型上方施加前屈、后伸及轴向压缩载荷,分别将椎体前沿压缩至90%、80%、70%......10%9个状态,提取T11下终板及L1上终板的MISES应力,获得了压缩状态与邻近终板应力关系曲线。结果该模型高度逼真,能真实反映实际受力状态;T11椎体下位终板和L1椎体上位终板的应力值与T12椎体(研究对象)前沿的压缩程度正相关。结论应力增加可能导致终板骨折可能性增加,进而增大相邻椎体的骨折风险,有限元分析结果能够为临床实践提供依据。
[Abstract]:Objective to establish different compression state models of the anterior edge of the vertebral body by finite element method and to analyze the correlation between the compression degree of the anterior edge of the vertebral body and the stress of the adjacent vertebral endplate. Methods based on the CT data of thoracic and lumbar segments of normal adult volunteers, the images were segmented, repaired and meshed to obtain the T11~L13 segment data of thoracolumbar vertebrae. ABAQUS software was used to obtain the realistic 3D finite element model. The model was loaded with physiological load to verify the validity of the normal model. The base of L1 model was fixed with full degree of freedom, and the MISES stress of lower end plate and upper end plate of L1 were extracted by applying forward flexion, extension and axial compression load on the top of T11 model, respectively, to compress the front of the vertebral body to 90,8080,70.109 states, and to extract the MISES stress of the lower end plate of T11 and the upper end plate of L1, respectively. The relationship between the compressive state and the stress of the adjacent endplate is obtained. Results the model was highly realistic and could reflect the actual stress state of the lower end plate and the upper end plate of the L1 vertebrae, which was positively correlated with the compression degree of the front edge of the T12 vertebra (object of study). Conclusion the increase of stress may increase the possibility of endplate fracture and then increase the fracture risk of adjacent vertebrae. The results of finite element analysis can provide the basis for clinical practice.
【作者单位】：南阳理工学院张仲景国医国药学院;
【基金】：河南省科技攻关项目(No:142102310107)
【分类号】：R683

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