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성인 척추 측만증에서 만곡의 분류에 따른 척추 분절 신경의 Stress 변화에 대한 연구
강경탁(Kyoung-Tak Kang),전흥재(Heoung-Jae Chun),김호중(Ho-Joong Kim),이근호(Guen-Ho Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The purpose of this study is to investigate the mechanism of nerve root impairment caused by the rotation and the lateral translation of scoliotic curve in degenerative lumbar scoliosis using finite element analysis, There have been many studies about degenerative lumbar scoliosis, However, few studies have showed the relationship between the curve pattern and nerve root compression, Furthermore, their theoretical hypotheses have not been confirmed by a bio-mechanical study, In order to investigate this issue, the finite element analysis model of degenerative lumbar scoliosis were considered in this study, At each simulation, the stress of nerve root was calculated at both sides of each vertebral segment, Moreover, the difference of canal diameters following the change of curve pattern was analyzed,
요추 유합술 후 인접 분절의 조기 퇴행성 변화 요인에 대한, 생체 역학적 분석
강경탁(Kyoung-Tak Kang),손주현(Ju-Hyun Son),전흥재(Heoung-Jae Chun),김호중(Ho-Joong Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The aim of this study is to investigate the change in biomechanical milieu following removal of pedicle screws or removal of spinous process with posterior ligament complex in instrumented single level lumbar arthrodesis. Four scenarios of L3-4 lumbar fusion were simulated: posterolateral fusion (PLF) at L3-4 using pedicle screw system with preservation of PLC (WiP c P), L3-4 lumbar posterolateral fusion state after removal of pedicle screw system with preservation of PLC (WoP c P), L3-4 using pedicle screw system without preservation PLC (WiP s P), L3-4 lumbar posterolateral fusion state after removal of pedicle screw system without preservation of PLC (WoP s P). For these models, we investigated the range of motion in all segments under moments. This study demonstrated that removal of pedicle screw system and preservation of PLC after complete lumbar spinal fusion could reduce the stress of adjacent segments synergistically and might have beneficial effects in preventing ASD.
강경탁(Kyoung-Tak Kang),전흥재(Heoung-Jae Chun),손주현(Ju-Hyun Son),김호중(Ho-Joong Kim),문성환(Seong-Hwan Moon),이환모(Hwan-Mo Lee),김가연(Ka-Yeon Kim) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.7
Previous studies have introduced the technique of spinous process osteotomy to decompress spinal stenosis, a procedure which aims to afford excellent visualization while minimizing destruction of tissues not directly involved in the pathologic process. However, biomechanically it has not been investigated whether the sacrifice of posterior spinous process might have potential risk of spinal instability or not, even though supra-spinous and inter-spinous ligaments are preserved. Therefore the aim of this study is to evaluate the biomechanical properties after spinous process osteotomy, using finite element analysis. The model of spinous process osteotomy exhibited no significant increase in disc stress or change in segmental range of motion. It is due to the fact that the instability of lumbar spine has been maintained by the two-types of ligaments compared with the prior surgical technique. Therefore, according to the finite element result on this study, this osotetomy was considered to be a clinically safe surgical procedure and could not cause the instability of the lumbar spine.
척추 유합술 후, 인접 분절의 스트레스에 대한 척추경 나사못에 대한 영향
강경탁(Kyoung-Tak Kang),전흥재(Heoung-Jae Chun),손주현(Ju-Hyun Son),김호중(Ho-Joong Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Since the advent of pedicle screw fixation system, posterior spinal fusion has markedly increased. This internal fixation system has been reported to enhance the fusion rates, thereby becoming very popular procedure in posterior spinal arthrodesis. Although some previous studies have shown the complications of spinal instruments removal, i.e. loss of correction and spinal collapse in scoliosis or long spine fusion patients, there has been no study describing the benefit or complications in lumbar spinal fusion surgery of one or two level. In order to clarify the effect of removal of instruments on mechanical motion profile, we simulated a finite element model of instrumented posterolateral fused lumbar spine model, and investigated the change of mechanical motion profiles after the removal of instrumentation.
성인 척추 측만증에서 황색인대와 신경근사이의 경계조건에 따른 Stress변화에 관한 연구
강경탁(Kyoung-Tak Kang),전흥재(Heoung-Jae Chun),김호중(Ho-Joong Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The purpose of this study is to investigate the mechanism of nerve root impairment caused by the rotation and the lateral translation of scoliotic curve in degenerative lumbar scoliosis using finite element analysis. Few studies have shown the relationship between the curve pattern and nerve root symptoms in degenerative lumbar scoliosis (DLS), and the understanding of the mechanism about DLS also remains unclear. Here, the authors used a finite element model of DLS to investigate the mechanism of nerve root stretching, as caused by the rotation and the lateral translation or bending of the scoliotic curve in DLS. In order to investigate this issue, the finite element analysis model of degenerative lumbar scoliosis were considered in this study. In each simulation, the stress between nerve root and ligament flavum was calculated according to boundary condition in both sides of each vertebral segment.
Kyoung-Tak Kang(강경탁),Heoung-Jae Chun(전흥재),Ho-Joong Kim(김호중),이광일,장주웅,심영복 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Facet joint orientation and facet tropism are presented as the potential anatomical predisposing factors for lumbar degenerative changes that may lead in turn to early degeneration and herniation of the corresponding disc or to degenerative spondylolisthesis. However, no biomechanical study of this concept has been reported. Three models, F50, F55, and F60 were simulated with different facet joint orientations (50°, 55°, and 60° relative to coronal plane) at both L2-3 facet joints. A facet tropism (FT) model was also simulated to represent a 50° facet joint angle at the right side and a 60° facet joint angle at the left side in the L2-3 segment. The F50, F55, and F60 models did not differ in the intradiscal pressures generated under four pure moments: but under anterior shear force, the F60 and FT models showed increases of intradiscal pressure. The F50 model under extension and the F60 model under torsion each generated an increase in facet contact force. In all conditions tested, the FT model yielded the greatest increase of intradiscal pressure and facet contact force of all the models.
강경탁(Kyoung-Tak Kang),전흥재(Heoung-Jae Chun),손주현,김호중(Ho-Joong Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The aim of this study is to evaluate the bio-mechanical properties after spinous process osteotomies, using finite element analysis. We developed a three-dimensional, non-linear finite element model of the lumbar spine that consisted of three lumbar vertebrae, intervertebral discs and associated spinal ligaments. The validation part included the loading model with 9 Nm of bending moment in various loading modes without any preload, for the intact model. For the physiologic load, the range of motion of the simulated intact model was within one standard deviation of previous cadaveric studies. In the model of spinous process osteotomy, the disc pressure and segmental range of motion was not changed significantly. Therefore, these procedures are considered as bio-mechanically safe procedure, and could not cause the instability
강경탁(Kyoung-Tak Kang),손주현(Ju-Hyun Son),전흥재(Heoung-Jae Chun),김호중(Ho-Joong Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Previous reports have introduced the technique of spinous process osteotomy to decompress spinal stenosis, a procedure which aims to afford excellent visualzation while minimizing destruction of tissues not directly involved in the pathologic process. however, bio-mechanically it has not been investigated whether the sacrifice of posterior spinous process might have potential risk of spinal instability or not, even though supra-spinous and inter-spinous ligament are preserved. Therefore the aim of this study is to evaluate the bio-mechanical properties after spinous process osteotomiy, using finite element analysis. In the model of spinous process osteotomy the increase of stress in the disc and segmental rangesof motions were not changed significantly. It is due to the fact that the instability of lumbar spine has been maintained by the two-types of ligaments compared with the prior surgical technique. Therefore, according to the finite element result on this study, these osotetomy was considered to be a clinicallysafe surgical procedure and could not cause the instability of patient.