Finite element analysis of vertebral column resection versus vertebral column decancellation in treatment of ankylosing spondylitis kyphosis
10.3969/j.issn.2095-4344.0124
- VernacularTitle:去松质骨截骨与全脊柱截骨治疗强直性脊柱炎后凸畸形的有限元分析
- Author:
Jiang XIE
1
;
Yu-Kun ZHANG
;
Li LI
;
Jun-Yi MA
;
Yuan MA
;
Jiang-Tao SUI
;
Yong MA
;
Hui LI
Author Information
1. 新疆医科大学第六附属医院脊柱外一科
- From:
Chinese Journal of Tissue Engineering Research
2018;22(7):1102-1107
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND: Sagittal imbalance makes significant effect on spinal biomechanics, and choosing osteotomy for ankylosing spondylitis depends on its biomechanics characteristics. OBJECTIVE: To establish a three-dimensional (3D) finite element model of kyphosis in ankylosing spondylitis treated by osteotomy on software, and to analyze its biomechanical properties, thus providing theoretical basis for clinical practice. METHODS: A 3D finite element model of kyphosis in ankylosing spondylitis was established based on CT data, and the predetermined angle of the osteotomy at L2was measured. Afterwards, vertebral column decancellation and vertebral column resection were stimulated, and then the biomechanical parameters were analyzed. RESULTS AND CONCLUSION: (1) The 3D finite element models of kyphosis in ankylosing spondylitis treated by vertebral column decancellation or vertebral column resection at L2were established successfully. (2) Finite element analysis on Ansys workbench 15.0 showed that the vertebral column decancellation (948 874, 1 564 477 nodes) and vertebral column resection (931 969, 1 548 812 nodes) were meshed and analyzed by 10-node tetrahedron solid element. (3) After loaded, the stress values of the vertebral column decancellation were higher than those of vertebral column resection; the equivalent stress on the screw was 40.946, 67.26, 493.64, 304.05, 75.359, and 146.31 MPa; the equivalent stress on the titanium rob was 391.01 MPa. (4) These results suggest that both two methods can reconstruct the sagittal balance, but vertebral column decancellation exhibits significantly higher stress values. Indeed, the incidence of internal fixation failure and complications in vertebral column decancellation is higher than that in vertebral column resection at the same segment and angle.
