中文摘要：

背景：随着老龄化的加剧,骨质疏松性髋部骨折的发生率及死亡率上升,研究其发病机制和防治方法具有重大意义。目前应用有限元分析法判断骨折的依据仅限于骨折失效的起始点或剖面视图的分布走势,未能完全反映骨折断裂的实际情况。目的：拟基于LS-DYNA有限元分析软件建立模拟跌倒外力致老年股骨颈骨折的断裂模型,评估断裂效果。方法：选取1例老年股骨颈骨折的CT影像资料;运用Mimics软件对健侧进行区域增长、腔隙填充、编辑蒙罩、重建健侧股骨近端模型;导入Hypermesh和LS-DYNA软件,划分网格、定义材料属性;设置失效参数和界面属性;模拟跌倒外力设置载荷和边界约束;计算出股骨颈骨折断裂模型,评估断裂效果。结果与结论：（1）健侧股骨近端三维模型有效性得到验证,基于LS-DYNA的老年股骨颈骨折三维有限元断裂模型与患侧骨折线走向的匹配度接近83%;（2）结果发现,基于LS-DYNA有限元分析软件能够较好地模拟出股骨颈骨折断裂情况,为不同跌倒外力致股骨颈骨折分型机制的探索提供实验基础。

英文摘要：

BACKGROUND：With the increasing of aging, the incidence and mortality of osteoporotic hip fracture wil rise. It is of great significance to study the pathogenesis and preventing method. At present, finite element analysis can be used to judge fracture, only for the distribution trend of fracture failure in the starting point or section view, but it cannot completely reflect actual situation of fracture. OBJECTIVE：To build the fracture model of the femoral neck fracture caused by fal ing-induced external force based on the finite element analysis LS-DYNA software, and to evaluate the effect of rupture. METHODS：CT image data of one case of elderly femoral neck fracture were col ected. Using Mimics software, region growth of the contralateral area, cavity fil ing, editing, rebuilding the contralateral proximal femur model were conducted. Data were imported in Hypermesh and LS-DYNA software for meshing, and defining material properties. The failure parameters and interfacial properties were set. The load and force boundary constraints simulating the fal ing were simulated. The model of femoral neck fracture was calculated. Rupture effect was evaluated. RESULTS AND CONCLUSION：（1） The validity of contralateral proximal femur three-dimensional model was verified. Based on the finite element analysis software LS-DYNA, the femoral neck fracture model matched the actual fracture line to a degree of close to 83%. （2） Above results confirmed that based on the finite element analysis, LS-DYNA software can wel simulate the femoral neck fracture, which provides experimental basis to the exploration of femoral neck fracture classification mechanism caused by different fal ing-induced external forces.