Finite element analysis of biomechanical properties of a novel posterior interlamina fusion cage

doi:10.3969/j.issn.2095-4344.1340

Abstract

Abstract:

BACKGROUND: With the increase of surgical amount in atlantoaxial spine, the problem of bone graft fusion has also been respected. Regardless of atlantoaxial anterior or posterior fusion cage, although the study of atlantoaxial fusion cage has never stopped, but because of the surgical technical difficulties, surgical risk, immature design, and many other reasons, there is still no related atlantoaxial fusion cage can be applied to clinic. Posterior atlantoaxial interlamina fusion cage is a new type that can be used with posterior screw-rod internal fixation system, but its biomechanical properties still need to be further studied.

OBJECTIVE: To evaluate the biomechanical characteristics of a new posterior atlantoaxial interlamina fusion cage by establishing a three-dimensional finite element model of the atlantoaxial interlamina fusion cage combined with posterior screw-rod internal fixation system.

METHODS: CT scan was used to obtain the image information of occipital and atlantoaxial of a healthy adult. Finite element analysis software was used to create a three-dimensional finite element analysis model of atlantoaxial interlaminar fusion cage combined with posterior screw-rod internal fixation system, and stress changes and stress nephogram of atlantoaxial interlaminar fusion cage under different motion states were analyzed.

RESULTS AND CONCLUSION: (1) The finite element model had good geometric similarity, including 206 745 elements and 72 496 nodes. (2) The maximum stress of atlantoaxial interlaminar fusion cage device was concentrated at the bone implant site of micro-titanium nail, and the maximum stress value under the condition of left and right rotation was higher than that under other conditions. (3) The stress of the posterior screw-rod system was mainly concentrated at the screw-bone junction and the screw-rod junction of the screw, and the maximum stress was generated around the root of the screw into the bone. (4) These results suggest that the mechanical stability of the new posterior atlantoaxial interlaminar fusion cage device is good, and it is a simple and safe type of atlantoaxial fusion cage device, which makes no influence on the stress of the posterior screw-rod system and is worthy of further investigation.

Key words: atlantoaxial, atlantoaxial interlaminar fusion cage, posterior internal fixation, screw rod system, three-dimensional finite element model, digital orthopedics, finite element analysis, biomechanics

CLC Number:

R445|R681.5|R318

Zou Xiaobao, Ma Xiangyang, Yang Haozhi, Ge Su, Chen Yuyue, Xia Hong, Wu Zenghui. Finite element analysis of biomechanical properties of a novel posterior interlamina fusion cage[J]. Chinese Journal of Tissue Engineering Research, 2019, 23(28): 4529-4534.

Figures/Tables 2

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