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

doi:10.3969/j.issn.2095-4344.2013.39.011

Abstract

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.

CLC Number:

R318

Zhou Jiang-jun, Zhu Zhi-yu, Zhao Min, Yan Ya-bo, Lei Wei, Lü Ren-fa, Yu Wei-tao, Zhang Li,Chen Rong-jian. Fast establishment of bone healing finite element model of femoral fracture treated by intramedullary nail fixation for 1 year[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(39): 6926-6931.

Figures/Tables 5

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