DOI: https://doi.org/10.22141/1608-1706.1.16.2015.80202

Mathematical modeling of anterior cervical interbody fusion with rigid and dynamic constructs in case of absence of full contact of interbody support and caudal endplate of СIV body

O.Ye. Barysh, A.V. Yaresko, S.A. Kozyryev

Abstract


Dynamic cervical plates are currently used more frequently to perform anterior cervical interbody fusion in cervical spine trauma and diseases. This is due to their experimental benefits over rigid plates. It is proved, that success of anterior cervical interbody fusion depends greatly on quality of interbody support. Objective: to investigate the stress-strain state of the finite element model of the cervical spine segments CIII/CVII in modeling of bisegmental anterior cervical interbody fusion CIV/CVI with ventral vertebral stabilization of CIV and CVI with rigid and dynamic hybrid plate under the absence of full contact of caudal endplate of СIV body and interbody support.
Methods. There was used improved finite element model of СIII/СVII functional spinal units. To make calculations we used ANSYS program. In the 1st variant of calculation rigid fixation of plate and screws was modeled. In the 2nd variant of calculation dynamic fixation and rotational movement of cranial screws and translational and rotational movement of caudal screws were modeled.
Results. When using rigid cervical plate in determined conditions interbody support doesn’t undergo constant axial load that may lead to pseudoartrosis or delayed fusion. For dynamic cervical plate von Mises stress in meshed cage and bone grafts didn’t significantly change that indicates presence of constant axial load on those elements.
Conclusion. In modeling anterior cervical interbody fusion with rigid cervical plates we observed stress shielding phenomenon; when using dynamic plates load is distributed more evenly between grafts and elements of fixed functional spinal units.


Keywords


mathematical modeling; finite element method; anterior cervical interbody fusion; rigid cervical plates; dynamic cervical plates

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