过伸复位治疗胸腰椎压缩性骨折关节突关节动态力学有限元分析

目的建立胸腰段三维有限元模型，观察过伸复位治疗胸腰椎压缩性骨折关节突关节的动态生物力学特性。方法依据1例T12椎体压缩性骨折患者的210层Dieom3．0标准CT图片，建立T12椎体单纯压缩性骨折的胸腰段有限元模型；验证模型的有效性后，模拟过伸复位手法约束L2下端所有面，给T11椎体上端一个纵向牵引力，分别于T11、T12、L1棘突顶点给予垂直朝向椎体、3．0cm的位移。程序运算，读取受压椎骨左右关节突关节的受力情况。结果建立了外形逼真、生物力学全面的T12椎体压缩性骨折的胸腰段三维有限元模型，复位中关节突关节承受了较大的压应力且逐渐增大，以过伸支点在T12棘突顶点时的受力最大、最稳定，骨折复位最彻底。结论建立了胸腰段三维有限元模型。过伸复位支点应在骨折椎骨棘突顶点，关节突关节在过伸复位中起着支点的作用，其承受较大的压应力是胸腰椎骨折患者后期出现腰背痛的原因之一。

Dynamic biomechanical analysis of zygapophysial joints about the treatment of thoracolumbar spine compression fracture by hyperextending based on finite element method

Objective To establish the 3D finit element model of thoroacolumbar spine and to observe the dynamic biomechanical characteristics of zygapophysial joints about the treatment of thoracolumbar spine compression fracture by hyperextending.Methods The 3D finite element model of compression fracture of T12 was based on the 210-layer consecutive CT Dicom format images from one patient of compression fracture of T12.The hyperextending was simulated after the model was proven effective.Bound the lower of T12,impos...