腰椎疲劳骨折的有限元分析

The finite element analysis on fatigue fracture of lumbar vertebrae

目的：了解腰椎疲劳骨折后各结构力学变化。方法：建立腰椎三维有限元模型模拟腰椎疲劳骨折的载荷状态。结果：骨折后各结构位移增加，椎间盘膨出半径增大，皮质骨，松质骨，裂纹两端应力增加。结论：腰椎疲劳骨折后各结构应力增加，小梁裂纹表现出明显的裂纹扩展趋势，增大的椎间盘膨出半径是引起下腰痛的主要原因。

Objective:To observe the mechanical change of every element of lumbar vertebrae after fatigue fracture.Methods:A three dimensional finite element model of lumbar vertebrae was developed to imitate the loading condition of fatigue fracture of lumbar vertebrae.Results:The displacements of every element increased after fracture.Meanwhile the expending radius of the intervertebral disc,the stress in cortical bone,cancellous bone and both terminals of trabecular failure would increase also.Conclusions:The stress of every element of lumbar vertebrae increased after fatigue fracture.The expanding trend of the trabecular failure was obvious.The increased radius of expanding disc might be the major cause of low lumbar myalgia.