Finite element analysis of vertebral column resection versus vertebral column decancellation in treatment of ankylosing spondylitis kyphosis

doi:10.3969/j.issn.2095-4344.0124

Abstract

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 L₂ was 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 L₂ were 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.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Spondylitis, Ankylosing, Kyphosis, Biomechanics, Finite Element Analysis, Osteotomy, Tissue Engineering

CLC Number:

R318

Xie Jiang, Zhang Yu-kun, Li Li, Ma Jun-yi, Ma Yuan, Sui Jiang-tao, Ma Yong, Li Hui. Finite element analysis of vertebral column resection versus vertebral column decancellation in treatment of ankylosing spondylitis kyphosis [J]. Chinese Journal of Tissue Engineering Research, 2018, 22(7): 1102-1107.

Figures/Tables 2

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