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Title:
Three-dimensional finite element analysis of unilateral and bilateral pedicle screw fixation with intervertebral body fusion for degenerative lumbar instability
Author: Li QL1; Yun C1; Li SC1; Zhang HS(张虎生)2
Source: INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL MEDICINE
Issued Date: 2016
Volume: 9, Issue:2, Pages:3457-3464
Abstract: This study aims to establish three-dimensional finite element models of lumbar instability, and compares the biomechanics of unilateral and bilateral pedicle screw fixation with intervertebral body fusion. Simulated physiological loads with axial compression, anterior flexion, posterior extension, left lateral bending, right lateral bending, left-handed rotation, and right-handed rotation were applied in unilateral and bilateral fixation models. The stresses of pedicle screws, intervertebral fusion cages, and adjacent intervertebral discs, and the displacement of the vertebral body in two models were recorded and compared. Under 7 kinds of loads, the stresses of screws in a unilateral fixation model were higher than in a bilateral fixation model, but there were no significant differences (P>0.05). Under loads with left and right lateral bending, and left-and right-handed rotation, the stresses of intervertebral fusion cages in a unilateral fixation model were significantly higher than in a bilateral fixation model (P<0.05). Under 6 kinds of loads except for axial compression, the stresses of adjacent upper and lower intervertebral discs in a bilateral fixation model were clearly greater than in a unilateral fixed model (P<0.05), and the stress of upper intervertebral discs was clearly greater than that of lower intervertebral discs (P<0.05). There was no significant difference in L4 vertebral body displacement between the two models under different loads (P>0.05). Unilateral pedicle screw fixation with intervertebral body fusion can be used for treatment of lumbar instability. It can provide initial stability for spinal fusion, and reduce the effect on adjacent segment degeneration.
Keyword: Lumbar instability ; pedicle screw fixation ; biomechanics ; finite element analysis
Language: 英语
Indexed Type: SCI
WOS ID: WOS:000374655200339
ISSN: 1940-5901
Department: LNM实验平台
Classification: Q4
First Institution (Yes or Not): False
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60685
Appears in Collections:非线性力学国家重点实验室_期刊论文

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description.institution: 1.Shijingshan Hosp Beijing City, Dept Orthopaed, Beijing 100043, Peoples R China.
2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China

Recommended Citation:
Li QL,Yun C,Li SC,et al. Three-dimensional finite element analysis of unilateral and bilateral pedicle screw fixation with intervertebral body fusion for degenerative lumbar instability[J]. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL MEDICINE,2016-01-01,9(2):3457-3464.
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