Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (52): 9729-9733.doi: 10.3969/j.issn.1673-8225.2011.52.009

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Three-dimensional finite element analysis of anterior plate fixation for the treatment of sacroiliac joint dislocation

Xiao Jin1, Yin Qing-shui1, Zhang Mei-chao2, Zhao Wei-dong2, Li Jian-yi2   

  1. 1Hospital of Orthopedics, Guangzhou General Hospital of Guangzhou Military Command of Chinese PLA, Guangzhou  5100510, Guangdong Province, China
    2Institute of Clinical Anatomy, Southern Medical University, Guangzhou  510515, Guangdong Province, China
  • Received:2011-05-31 Revised:2011-08-11 Online:2011-12-24 Published:2011-12-24
  • About author:Xiao Jin☆, Doctor, Hospital of Orthopedics, Guangzhou General Hospital of Guangzhou Military Command of Chinese PLA, Guangzhou 5100510, Guangdong Province, China xiaojinhn@yahoo.com.cn

Abstract:

BACKGROUND: Most reported biomechanical studies on sacroiliac joint injury and fixation use cadavers or artificial bone models to simulate the sacroiliac joint injury.
OBJECTIVE: To analyze the vertical stability of anterior plate fixation for sacroiliac joint dislocation using three-dimensional finite element method.
METHODS: The anterior plate fixation model of unilateral sacroiliac joint dislocation was constructed on the basis of the three-dimensional finite element model of a complete pelvis. An axial load of 500 N was applied on the model; the cloud pictures of stress, strain and displacement were obtained after calculation and compared with that of the complete pelvis under the same conditions.
RESULTS AND CONCLUSION: Stress concentration occurred at the internal fixation system; the maximum stress was found at the screws near the injured sacroiliac joint, far greater than the maximum stress of the complete pelvis under the same condition. The maximum strain was found in the healthy sacroiliac joint; the fixed sacroiliac joint had no strain. The maximum displacement was found in the injured sacroiliac joint; it was about twice longer than the complete pelvis. These findings indicate that the vertical stability of pelvis is poor using anterior plate internal fixation treatment for sacroiliac joint dislocation; and stress concentration occurs at the screws and plates.

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