Biomechanical effects of location and extent of intravertebral vacuum cleft on the stability of osteoporotic vertebrae
- J Third Mil Med Univ Vol. 39, Issue 4, Pages: 373-378(2017)
- 作者机构：
- 作者简介：
- 基金信息：the Medical Science and Technology Development Research Program of Ministry of Health(W2012ZT07，W2014ZT256);the Medical Research Foundation of Guangdong Provincial Health Department(B2014175)
DOI：10.16016/j.1000-5404.201607156
CLC：Received：25 July 2016，
Published：28 February 2017
- 稿件说明：
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Weibo Yu, De Liang, Xiaobing Jiang, et al. Biomechanical effects of location and extent of intravertebral vacuum cleft on the stability of osteoporotic vertebrae[J]. J Third Mil Med Univ, 2017, 39(4): 373-378.
Weibo Yu, De Liang, Xiaobing Jiang, et al. Biomechanical effects of location and extent of intravertebral vacuum cleft on the stability of osteoporotic vertebrae[J]. J Third Mil Med Univ, 2017, 39(4): 373-378. DOI： 10.16016/j.1000-5404.201607156.
摘要
Abstract
Objective
2
To investigate the biomechanical effects of location and extent of intravertebral vacuum cleft (IVC) on the stability of osteoporotic vertebrae.
Method
2
Based on previous studies and our established and validated osteoporotic T11~L1 finite element (FE) model
9 IVC FE models in T12 were simulated stepwise. Firstly
the anterior half of cancellous bone with 2 mm in height was resected in different locations adjacent to superior (S) or inferior (I) endplate or in the central (C) of vertebral body
resulting in 3 mild IVC models (S1
C1
I1). Then
the mild IVC models were developed to 6 types of severe IVC by extended resection of the cancellous bone toward either superoinferior (S2
C2
I2) or anteroposterior (S3
C3
I3) direction. The magnitudes and distributions of the von Mises stress in cortical bone of the 9 simulated IVC models as well as intact model were evaluated under all physiologic conditions of loading.
Results
2
For all IVC models
the maximum von Mises stress appeared in the anterior wall under flexion
followed by posterior wall under extension. In the mild IVC models
the von Mises stress was remarkably increased by at least 17% compared to the intact model when the IVC was adjacent to endplates under flexion. But the increase was. 5% when IVC was located centrally in vertebral body. Furthermore
the maximum stress was increased along the progression of mild to severe IVC models. While less than 3% of maximum stress magnitude increased in the mild model when the extent of IVC expanded toward superoinferior direction in anterior column
more than 8% was increased in the severe IVC model when expanded to the middle column under all the physiological loadings.
Conclusion
2
Except the central IVC
the majority of IVC models stimulated by varied locations and extents can cause significant instability of injured vertebrae
and thus early vertebral augmentation is required for vertebral stability and prevention of progressive collapse.
关键词
Keywords
references
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