胸腰椎骨折伤椎置钉不同运动状态的有限元研究

发布时间：2019-01-23 20:46

【摘要】：目的构建胸腰椎骨折伤椎置钉的有限元模型,可以获得直观的不同运动状态下系统的力学效果,对于患者的康复、系统稳定性的评估及预后都有非常重要的意义。文中旨在采取有限元分析方法胸腰椎骨折伤椎置钉模型的不同运动状态的生物力学效应。方法选取2014年6月南京军区南京总医院骨科健康志愿者1名,通过健康志愿者胸腰椎CT平扫数据构建有限元模型,采用几何裁剪法进行骨折模拟和复位,装配伤椎置钉的后路矫形内固定系统,模拟不同的运动状态,获得钉棒系统上的应力云图和位移量图。结果对于经伤椎置钉后路钉棒系统的六钉两棒内固定系统,采用有限元运算的方法模拟了其在空间的不同运动方式下的生物力学特点,是由6个方向(前屈、背伸、左侧弯、右侧弯、左扭转、右扭转)的运动所组合而成的。背伸最大应力[(94.99±1.72)Mpa]、最大位移[(0.185 4±0.005 2)mm]较前屈[(126.82±5.56)Mpa、(0.250 2±0.005 0)mm]、左侧弯[(152.18±9.13)Mpa、(0.317 2±0.004 8)mm]、右侧弯[(159.58±13.54)Mpa、(0.331 5±0.005 1)mm]显著减小(P0.05)。结论采用有限元分析的方法能够获得清晰直观的生物力学数据,为手术疗效的评估、术后康复方法的制定及评估胸腰椎内固定系统稳定性提供了有效的证据。
[Abstract]:Objective to construct a finite element model of thoracolumbar fracture injury with screw insertion, which can obtain intuitive mechanical effects under different motion states, and is of great significance for patients' rehabilitation, evaluation of system stability and prognosis. The purpose of this paper is to use finite element method to analyze the biomechanical effects of different motion states of thoracolumbar fractures. Methods one healthy volunteer from Department of Orthopaedics, Nanjing military region General Hospital, Nanjing military region in June 2014, was selected to construct a finite element model by CT plain scan data of thoracolumbar vertebrae of healthy volunteers. The fracture was simulated and reduced by geometric clipping. The posterior orthopedic internal fixation system was assembled to simulate the different motion states and to obtain the stress cloud map and displacement map of the screw rod system. Results for the internal fixation system with six nails and two rods, the biomechanical characteristics under different motion modes in space were simulated by finite element method. The biomechanical characteristics of the system were divided into 6 directions (forward flexion, back extension, left bending). The right bend, the left torsion, the right torsion) are combined together. The maximum stress of dorsiflexion [(94.99 卤1.72) Mpa], maximum displacement [(0.185 4 卤0.005 2) mm] were higher than those of forward flexion [(126.82 卤5.56) Mpa, (0.250 2 卤0.005 0 mm], left side bend [(152.18 卤9.13) Mpa,]. (0.317 2 卤0.004 8) mm and (159.58 卤13.54) Mpa, (0.331 5 卤0.005 1 mm) decreased significantly (P0.05). Conclusion the method of finite element analysis can obtain clear and intuitionistic biomechanical data, which provides effective evidence for the evaluation of surgical efficacy, the formulation of postoperative rehabilitation methods and the evaluation of the stability of thoracolumbar internal fixation system.
【作者单位】：南京军区南京总医院骨科;
【基金】：南京军区医学科技创新课题(12MA080);南京军区南京总医院军事医学项目(YYMS2014002)
【分类号】：R683

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