中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (44): 6606-6611.doi: 10.3969/j.issn.2095-4344.2016.44.010

• 数字化骨科 digital orthopedics • 上一篇    下一篇

基于LS-DYNA模拟老年股骨颈骨折的有限元分析

李鹏飞1,杜根发1,林梓凌2,庞智晖2,樊粤光2,何祥鑫1,孙文涛1,陈锦伦1   

  1. 1广州中医药大学,广东省广州市 510405;2广州中医药大学第一附属医院,广东省广州市 510405
  • 修回日期:2016-08-12 出版日期:2016-10-28 发布日期:2016-10-28
  • 通讯作者: 林梓凌,博士,副主任医师,广州中医药大学第一附属医院,广东省广州市 510405
  • 作者简介:李鹏飞,男,1990年生,在读博士,主要研究方向为运用生物力学研究骨科疾病。
  • 基金资助:

    国家自然科学基金(81373652);广东省科技计划(2016A020215141)

Finite element analysis of elderly femoral neck fracture based on LS-DYNA

Li Peng-fei1, Du Gen-fa1, Lin Zi-ling2, Pang Zhi-hui2, Fan Yue-guang2, He Xiang-xin1, Sun Wen-tao1, Chen Jin-lun1   

  1. 1Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China; 2First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • Revised:2016-08-12 Online:2016-10-28 Published:2016-10-28
  • Contact: Lin Zi-ling, M.D., Associate chief physician, First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • About author:Li Peng-fei, Studying for doctorate, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81373652; the Science and Technology Project of Guangdong Province, No. 2016A020215141

摘要:

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文题释义:
老年股骨颈骨折:它和股骨转子间骨折同样作为髋部骨折,是老年骨质疏松性骨折的常见的一种。随着老龄化的加剧,其发生率必然增加。目前认为其发病机制多与骨密度下降和外力跌倒有关,但股骨颈骨折的不同亚型的发生机制还在探讨之中。
材料断裂力学:材料在不断负荷作用下发生微裂纹,导致材料刚度和强度等降低,微裂纹积累到一定程度就出现裂纹扩展,继而发生大面积的裂纹,进而导致材料的折断和失效。近几十年来,国内外研究者针对断裂问题进行了大量实验和研究,这使得断裂力学应运而生并得到发展。
 
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。

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

ORCID:
0000-0002-3222-9112(李鹏飞)

关键词: 骨科植入物, 数字化骨科, 老年股骨颈骨折, LS-DYNA软件, 断裂, 有限元分析, 国家自然科学基金

Abstract:

BACKGROUND: With the increasing of aging, the incidence and mortality of osteoporotic hip fracture will 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 falling-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 collected. Using Mimics software, region growth of the contralateral area, cavity filling, 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 falling 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 well simulate the femoral neck fracture, which provides experimental basis to the exploration of femoral neck fracture classification mechanism caused by different falling-induced external forces.

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

Key words: Femoral Neck Fractures, Aged, Finite Element Analysis, Tissue Engineering

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