Biomechanical analysis of sagittal plane balance of type IIIA ankylosing kyphosis reconstructed by different osteotomy segments

doi:10.3969/j.issn.2095-4344.2798

Abstract

Abstract:

BACKGROUND: Orthopedic technique of ankylosing kyphosis is more mature. The surgeons can also choose different osteotomy methods according to the patients’ bending type and bending degree. However, due to the lack of widely recognized classification system, the description of ankylosing kyphosis and the formulation of operation strategy are confused.

OBJECTIVE: To establish a three-dimensional finite element model of kyphosis osteotomy in ankylosing spondylitis using computer-aided software and analyze its biomechanical characteristics.

METHODS: Image data of a patient with ankylosing kyphosis of type IIIA with strong 301 classification were obtained to establish a three-dimensional finite element model of ankylosing kyphosis. The osteotomy angles of T₁₂, L₁, L₂ and L₃ different segments were measured. Osteotomy of cancellous bone was simulated. The model after osteotomy was fixed with nail bar system. Biomechanical characteristics were analyzed.

RESULTS AND CONCLUSION: (1) The closer the osteotomy segment was to the tail end, the greater the screw stress was, and the order of the screw stress distribution was L₃ > L₂ > L₁ > T₁₂. The stress distribution characteristics of different osteotomy segments were the same. The screw stress was concentrated on the adjacent upper/lower two segments of the osteotomy segment, and was significantly greater than that of other segments. (2) The order of the titanium rod stress was L₂ > L₃ > L₁ > T₁₂. (3) The closer the bone segment was to the head, the greater the stress was, and the order of the stress was T₁₂> L₁ > L₂ > L₃. (4) The results show that for the type IIIA ankylosing kyphosis, the better degree of orthopedic can be obtained by selecting L₂ osteotomy segment, and the complications caused by the concentration of internal fixation stress distribution can be reduced.

Key words: ankylosing kyphosis, kyphosis, 301 classification, biomechanics, finite element analysis, vertebral column decancellation

CLC Number:

Li Hui, Gao Xiaoling, Ma Yuan. Biomechanical analysis of sagittal plane balance of type IIIA ankylosing kyphosis reconstructed by different osteotomy segments[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(30): 4824-4828.

Figures/Tables 10

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