Biomechanical changes of atlantoaxial pedicle screw-rod fixation: a finite element analysis

doi:10.3969/j.issn.2095-4344.0362

Abstract

Abstract:

BACKGROUND: Atlantoaxial pedicle screw-rod fixation has been extensively applied in clinic, especially for upper cervical lesions with osteoporosis. But there are few biomechanical studies.

OBJECTIVE: To investigate the biomechanical features of atlantoaxial pedicle screw-rod fixation by three-dimensional finite element analysis.

METHODS: CT data of occipital bone and atlantoaxial vertebrae were obtained from a healthy adult volunteer, and the three-dimensional finite element analysis model of atlantoaxial pedicle screw-rod fixation was established. The changes of von Mises Stress of the internal fixation system under different loads (flexion, extension, left and right lateral bending, as well as left and right axial rotation by Abaqus) were analyzed.

RESULTS AND CONCLUSION: (1) Atlantoaxial pedicle screw-rod fixation significantly reduced the motion range of upper cervical vertebra. (2) The stress concentrated on the bone-screw interface and screw-rod interface under different postures. The maximum stress located at the root of axoid pedicle screws under flexion, left and right lateral bending, as well as left and right axial rotation. (3) The maximum stress located at the root of atlas pedicle screws under extension. (4) Mises stress was obviously increased under rotation. (5) Atlantoaxial pedicle screw-rod fixation is safe and reliable. Stress concentration always appears at the root of screw and the Mises stress is increased obviously under rotation.

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: Axis, Finite Element Analysis, Biomechanics, Tissue Engineering

CLC Number:

R318

Chen Shu-jin, Ma Xiang-yang, Yang Jin-cheng, Yin Qing-shui, Yang Min, Zou Xiao-bao. Biomechanical changes of atlantoaxial pedicle screw-rod fixation: a finite element analysis [J]. Chinese Journal of Tissue Engineering Research, 2018, 22(31): 4970-4974.

Figures/Tables 1

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