Biomechanical Analysis of Atlantoaxial Joint Dysfunction Syndrome Based on Three-Dimensional Finite Element Model
Objective:To analyze the biomechanical characteristics of the upper cervical spine in patients with atlantoaxial joint dysfunction syndrome.Methods:A finite element model of atlantoaxial joint dysfunction syndrome was constructed based on the imaging data of a patient and its validity was verified.The model was applied to simulate the movement of the cervical spine in all directions,and the stress maxima and stress distributions of the articular surface,C2/3 intervertebral disc and muscle were analyzed under physiological load.The stress status of the model was compared with that of the pre-viously established normal finite element model of the upper cervical spine,so as to determine the influence of atlantoaxial joint dysfunction syndrome on the biomechanics of the upper cervical spine.Results:Compared with the normal model,the global stress distribution of the atlantoaxial joint dysfunction syndrome model was uneven,and the right side of the model was greater than the left side.In the finite element model of atlantoaxial joint disorder,there were obvious stress inhomo-geneity in the lateral atlantoaxial joint,intervertebral disc and muscle,and obvious stress concentration in the lateral atlan-toaxial joint on the oblique side,the posterior side of the intervertebral disc and the insertion of the major rectus muscle behind the head.Conclusion:Atlantoaxial joint disorders can destroy the overall mechanical balance of the upper cervical spine,resulting in uneven stress distribution of the articular surface,intervertebral disc and muscle,which may lead to neck pain and spinal degeneration.
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