中国组织工程研究 ›› 2013, Vol. 17 ›› Issue (39): 6926-6931.doi: 10.3969/j.issn.2095-4344.2013.39.011

• 骨科植入物 orthopedic implant • 上一篇    下一篇

股骨骨折髓内钉置入内固定后1年骨愈合有限元模型的快速建立

周江军1,朱治宇1,赵  敏1,严亚波2,雷  伟2,吕仁发1,余维涛1,张  立1,陈荣剑1   

  1. 1解放军第184医院骨科,江西省鹰潭市  335000;2解放军第四军医大学西京医院骨科,陕西省西安市  710032
  • 出版日期:2013-09-24 发布日期:2013-09-24
  • 通讯作者: 赵敏,硕士,副主任医师,解放军第184医院骨科,江西省鹰潭市 335000 zhaomin184@sina.com
  • 作者简介:周江军★,男,1981年生,江西省万年县人,汉族,2011年解放军第四军医大学毕业,硕士,主治医师,主要从事数字骨科、创伤骨科方面的研究。 zhoujiangjun@hotmail.com
  • 基金资助:

    南京军区医学科技创新课题资助项目(10MA058)*

Fast establishment of bone healing finite element model of femoral fracture treated by intramedullary nail fixation for 1 year

Zhou Jiang-jun1 , Zhu Zhi-yu1, Zhao Min1, Yan Ya-bo2, Lei Wei2, Lü Ren-fa1, Yu Wei-tao1, Zhang Li1, Chen Rong-jian1   

  1. 1 Department of Orthopedics, the 184th Hospital of PLA, Yingtan  335000, Jiangxi Province, China; 2 Department of Orthopedics, Xijing Hospital, the Fourth Military Medical University, Xi’an  710032, Shaanxi Province, China
  • Online:2013-09-24 Published:2013-09-24
  • Contact: Zhao Min, Master, Associate chief physician, Department of Orthopedics, the 184th Hospital of PLA, Yingtan 335000, Jiangxi Province, China zhaomin184@sina.com
  • About author:Zhou Jiang-jun★, Master, Attending physician, Department of Orthopedics, the 184th Hospital of PLA, Yingtan 335000, Jiangxi Province, China zhoujiangjun@hotmail.com
  • Supported by:

    Nanjing Military Medical Technology Innovation Project, No. 10MA058*

摘要:

背景:当前判断内固定取出后正常站立情况下股骨是否断裂仅依靠X射线或CT数据。
目的:通过有限元方法对股骨骨折髓内钉置入内固定1年取出内固定后的骨愈合模型进行分析,探讨该方法是否能判定内固定取出后骨折断端断裂。
方法:运用Mimics、Geomagic Studio、Abaqus等软件采用快速个体化建模方法对股骨骨折髓内钉置入内固定1年取出内固定后的骨愈合多层螺旋CT数据进行模型快速建立,并采取4种方法处理模型,分别为不作模型简化;对骨愈合区以外的模型表面网格给予50%简化;对骨愈合区以外的模型表面网格给予20%简化;对骨愈合区以外的模型表面网格给予10%简化。对于以上4种模型进行有限元分析,施加3,9倍重力载荷和约束,观察米赛斯应力最大值及其所处部位。
结果与结论:按照材料属性进行区别显示米赛斯应力的最大值及最小值,在不同应力载荷下,术后各类型材料的米赛斯应力最大值及最小值部位相同,各类型材料中,最大值均未位于骨折断端,不同方法的最大应力值部位相近,均在中远端1/4交界处,其中表面网格简化10%模型的数值偏倚小,网格处理、材料赋值及有限元分析运算时间最短。采用适当的个体化建模方法可以对骨折内固定取出后的骨折模型进行有限元分析,快速判断内固定取出是否导致骨折断端断裂。

关键词: 骨关节植入物, 骨科植入物, 有限元分析, 生物力学, 快速建模, 股骨骨折, 髓内钉, 骨愈合模型, 个体化, 简化模型, 其他基金

Abstract:

BACKGROUND: X-ray and CT data are common approaches for judging whether femur can be disrupted or not after removing fixation under normal standing.
OBJECTIVE: To analyze the bone healing model through finite element method after treated with intramedullary nail fixation for 1 year, and to investigate whether this method can judge disrupt or not on the fracture site after removing fixation. 
METHODS: Depend on fast individual establishment method, bone healing model of femur fracture were constructed based on data from multi-slice spiral CT with Mimics, Geomagic Studio and Abaqus softwares. And then four kinds of methods were used: no reduce; the surface mesh excluding healing area reduced for 50%; the surface mesh excluding healing area reduced for 20%; the surface mesh excluding healing area reduced for 10%. Finite element analysis was performed on the four models above. The models were loaded with 3 or 9 times weight loads and constraints to observe the maximum von Mises stress and the location.
RESULTS AND CONCLUSION: According to material properties, the node of the maximum and minimum Mises stress of different kinds of materials were same under different stress loadings. The maximum von Mises stress in different materials appeared in the fracture site, and the nodes of maximum von Mises stress of different methods were similar, both in the middle and distal 1/4 junction part. The value of model with surface meshing reduced for 10% was minimum, and time of meshing, assigning material and finite element analysis were shortest. Appropriate individual modeling method can rapidly judge whether disrupt or not in the fracture site after removing fixation through finite element analysis on the fracture model.

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