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Finite element analysis of the biomechanical effect of Coflex™ on the lumbar spine

 Dong-Hak Byun  ;  Dong Ah Shin  ;  Jin-Myung Kim  ;  So-Hee Kim  ;  Hyoung-Ihl Kim 
 Korean Journal of Spine (대한척추신경외과학회지), Vol.9(3) : 131-136, 2012 
Journal Title
 Korean Journal of Spine (대한척추신경외과학회지) 
Issue Date
Finite element analysis ; Interspinous implant ; Lumbar vertebrae ; Spinous process
Objective: The biomechanical properties of the CoflexTM (Paradigm Spine, NY, USA), a device designed to provide dynamic stabilization without lumbar fusion, have not been clearly defined. The purpose of this study was to determine the efficacy and biomechanical effect of CoflexTM using finite element model (FEM). Methods: A 3D geometric model of the L3-L5 was created by integrating computerized tomography (CT) images. Based on the geometric model, a 3D FEM was created and the CoflexTM model was incorporated into the base model. Mechanical load dependent on the postural changes and boundary conditions, were imposed to simulate various 3D physiological states. The simulation analysis included stress and strain distributions, intervertebral disc deformation, and the range of motion of the facet joint and lumbar spinous process. Results: CoflexTM significantly restrained displacement in extension, lateral bending and compression of joint between the L4-5 as one in the experimental group was observed -1.3% of flexion, -24.5% of extension, -44.5% of lateral bending and -37.2%. The average intradiscal pressure of the L4-5 decreased by 63% and the average facet contract force of the L4-5 decreased markedly by 34% in the experimental group. A load of 120 MPa from extension was observed at the base of spinous process in the experimental group. Conclusion: The CoflexTM can be safely used for achieving functional dynamic stabilization of the lumbar vertebral column while preserving the intactness of the other components. However, the fatigue fracture of the L4 spinous process should be carefully monitored.
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1. College of Medicine (의과대학) > Dept. of Neurosurgery (신경외과학교실) > 1. Journal Papers
Yonsei Authors
Shin, Dong Ah(신동아) ORCID logo https://orcid.org/0000-0002-5225-4083
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