- 作者：Liang Wang1 ; Bangke Zhang1 ; Shuo Chen2 ; Xuhua Lu1 ; xuhualu@hotmail.com" class="auth_mail" title="E-mail the corresponding author ; Zhi-Yong Li2 ; 3 ; zylicam@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Qunfeng Guo1
- 关键词：Cobb angles ; Computed tomography ; Degenerative lumbar scoliosis ; Facet joint forces ; Finite element ; Lumbar spine
- 刊名：World Neurosurgery
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：95
- 期：Complete
- 页码：126-133
- 全文大小：4126 K
Methods
A 3-dimensional finite element model of a normal lumbar spine was modified to simulate 3 different Cobb angles conditions (12.3°, 22.2°, and 31.8°). The stresses on the facet joint were calculated on both sides (right and left) of the each vertebra. Changes of stress and asymmetry in contact forces between facet joints in the development of DLS were quantitatively analyzed to better understand the development of DLS and the biomechanical forming mechanism.
Results
The results show that asymmetric responses of the facet joint forces exist in various postures and that such effect is amplified with larger curve. When the Cobb angle was smaller, the convex side of the facet joints suffered larger force. When the Cobb angle was larger than 20°, the concave side of the facet joints suffered larger force. In the axial-rotation cases, the facet joint compression is less often located on the ipsilateral side than the contralateral side at the same level.
Conclusions
With the asymmetric loading, facet joints compressive deformation appears on the concave side, and it decreases in the effect of the facet joints to limit the vertebral rotation and listhesis. Asymmetric loading on facet joint contact forces accelerates asymmetry in the lumbar spine.