Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (30): 5522-5525.doi: 10.3969/j.issn.1673-8225.2011.30.004

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Constructing a finite element model of osteonecrosis of the femoral head

Li Xiao-lin1, Lü Zhi-peng2, Liu Ying-jun3   

  1. 1Medical School, 2College of Mechanical Engineering, Yangtze University, Jingzhou  434023, Hubei Province, China; 3First Affiliated Hospital of Yangtze University, Jingzhou  434023, Hubei Province, China
  • Received:2011-01-29 Revised:2011-03-07 Online:2011-07-23 Published:2011-07-23
  • About author:Li Xiao-lin☆, Doctor, Associate profesor, Medical School, Yangtze University, Jingzhou 434023, Hubei Province, China peterlee869@163.com

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Abstract:

BACKGROUND: Osteonecrosis of the femoral head is a difficult and complicated case in clinical orthopedics. Its incidence and treatment are related to bio-mechanical problems, Biomechanical study plays a great role to further treatment of the disease.
OBJECTIVE: To construct a three-dimensional finite element model of osteonecrosis of the femoral head based on CT images.
METHODS: The 142-layer of 0.625-mm-thick consecutive CT Dicom format images of osteonecrosis of the femoral head making use of thin layer scanning technique was directly read into the Mimics software. The following procedures were: Defining bone organization threshold, withdrawing each outline, partitioning each edge of layer picture, editing selectively and repairing by hole processing. After redundancy data were cleaned, the three-dimensional geometry model of osteonecrosis of the femoral head was acquired. Then area mesh could be kept as the document Ansys named. lis as the suffix and be introduced into Ansys software directly to mesh body, and then the body mesh was transferred to Mimics to assignment on the basis of CT values, once again import Ansys to establish 3-D finite element model.
RESULTS AND CONCLUSION: A realistic appearance and calculation accuracy three-dimensional finite element model of osteonecrosis of the femoral head was established. The results showed that based on sophisticated CT scanning technique and Mimics software can directly assign values, which make the establishment of three-dimensional finite element models of osteonecrosis of the femoral head faster and more accurate.

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