Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (13): 2295-2298.doi: 10.3969/j.issn.1673-8225.2011.13.005

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Three-dimensional finite element analysis of pedicle screw stress following two intervertebral fusion treatments in L4/5 segment   

Li Dong-zhe1, Chen Fei2, Kang Yi-jun2   

  1. 1Department of Spinal Surgery, Xiangya Hospital, Central South University, Changsha  410008, Hunan Province, China
    2Department of Spinal Surgery, the Second Xiangya Hospital of Central South University, Changsha  410013, Hunan Province, China
  • Received:2010-11-10 Revised:2011-01-24 Online:2011-03-26 Published:2011-03-26
  • Contact: Chen Fei, Doctor, Associate professor, Department of Spinal Surgery, the Second Xiangya Hospital of Central South University, Changsha 410013, Hunan Province, China
  • About author:Li Dong-zhe☆, Studying for doctorate, Department of Spinal Surgery, Xiangya Hospital, Central South University, Changsha 410008, Hunan Province, China

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Abstract:

BACKGROUND: No reports regarding three-dimensional (3-D) finite element analysis of pedicle screws stress following autologous iliac crest interbody fusion combined with internal pedicle screw fixation or lumbar vertebra grating can be searched by the authors. 
OBJECTIVE: To compare the stress distribution of lumbar pedicle screws of two surgical approaches, double fusion cage versus autologous iliac crest interbody fusion combined with internal pedicle screw fixation in lumbar L4-5 segment models.
METHODS: Continuous horizontal scanning images of normal lumbar vertebra from a 20-year-old male volunteer that were collected by spiral CT and constructed for L4-5 segment models. 3-D finite element models of posterior lumbar internal fixation with double cage (model A) or autologous iliac crest interbody fusion (model B) were constructed. Pressure was loaded on the upper surface of L4 to simulate lumbar compressions. The stress of the pedicle screws and cage were recorded and compared.
RESULTS AND CONCLUSION: 3-D finite element model of L4-5 segment internal pedicle screw fixation with two surgical approaches were validated. In every motion state, the stress of screw fixation of model B was obviously greater than that of model A (P < 0.05), and the maximum difference value located at end part of screw. The screw fixation of model B is more inclined to be fractured than model A.

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