Three-dimensional finite element analysis of in situ and reductive interbody fusion of lumbar spondylolisthesis

doi:10.3969/j.issn.2095-4344.2013.09.007

Abstract

Abstract:

BACKGROUND: Due to the complexity of the spinal structure, it is difficult to conduct the exact biomechanical analysis on the changes of the stress distribution characteristics of the lumbar segment after in situ and reductive interbody fusion.
OBJECTIVE: To compare the biomechanical changes of in situ and reductive interbody fusion of lumbar spondylolisthesis under mechanical loads and the effect of those changes on the lumbar stability through developing the three-dimensional finite element models of L₄/₅ degenerative spondylolisthesis treated with in situ and reductive interbody fusion pedicle screw internal fixation.
METHODS: The three-dimensional finite element models of L₄/₅segment of healthy male volunteers were established through analyzing the lower lumbar spine CT data and using the mimics, Catia, Patran and Marc softwares. Then the models were used to simulate the degenerative spondylolisthesis and to establish the L₄/₅ segment in situ and reductive interbody fusion and pedicle screw internal fixation models. The stress distribution characteristics of these two models under different mechanic loads were analyzed and the difference was compared.
RESULTS AND CONCLUSION: Under the loads of flexion, extension, right rotation and left bending, there was no significant difference of the stress on the vertebral body, pedicle screw fixator and interbody fusion cage between the L₄/₅segment degenerateive spondylolisthesis in situ and reductive interbody fusion and pedicle screw internal fixation models. Both the two models manifested that the pedicle screw fixator and interbody fusion cage take the majority of the loads. After the in situ and reductive interbody fusion internal fixation for the degenerative spondylolisthesis of the L₄/₅ segment, reduction or not has no great biomechanical influence on the fusion segment.

Key words: bone and joint implants, spinal implants, biomechanics, finite element analysis, stress, lumbar spondylolisthesis, decompression, in situ interbody fusion, reductive interbody fusion, pedicle screw internal fixation, photographs-containing paper of bone and joint implants

CLC Number:

R318

Ni Wei-feng, Xu Jian-guang, Xue Feng. Three-dimensional finite element analysis of in situ and reductive interbody fusion of lumbar spondylolisthesis[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(9): 1563-1570.

Figures/Tables 14

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