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Effects on the Adjacent Motion Segments according to the Artificial Disc Insertion  

Kim, Young-Eun (단국대학교 기계공학과)
Yun, Sang-Seok (단국대하교 대학원)
Publication Information
Journal of the Korean Society for Precision Engineering / v.24, no.8, 2007 , pp. 122-129 More about this Journal
Abstract
To evaluate the effect of artificial disc implantation and fusion on the biomechanics of adjacent motion segment, a nonlinear three-dimensional finite element model of whole lumbar spine (L1-S1) was developed. Biomechanical analysis was performed for two different types of artificial disc, ProDisc and SB $Charit{\acute{e}}$ III model, inserted at L4-L5 level and these results were also compared with fusion case. Angular motion of vertebral body, forces on the spinal ligaments and facet joint under sagittal plane loading with a compressive preload of 150 N at a nonlinear three-dimensional finite element model of Ll-S1 were compared. The implant did not significantly alter the kinematics of the motion segment adjacent to the instrumented level. However, $Charit{\acute{e}}$ III model tend to decrease its motion on the adjacent levels, especially in extension motion. Contrast to motion and ligament force changes, facet contact forces were increased in the adjacent levels as well as implanted level for constrained instantaneous center of rotation model, i.e. ProDisc model.
Keywords
Artificial Disc; Fusion; Motion Segment; Finite Element Model; Facet Contact Force;
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Times Cited By KSCI : 1  (Citation Analysis)
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