지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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Recently, flexible cages have been introduced in an attempt to absorb and reduce the abnormal load transfer along the anterior parts of the spine. They are designed to be used with the pedicle screw systems to allow some mobility at the index level while containing ROM at the adjacent level. In this study, a finite element (FE) study was performed to assess biomechanical efficacies of the flexible cage when combined with pedicle screws with flexible rods. The post-operated models were constructed by modifying the L4-5 of a previously-validated 3-D FE model of the intact lumbar spine (L2-S1): (1) Type 1, flexible cage only; (2) Type 2, pedicle screws with flexible rods; (3) Type 3, interbody fusion cage plus pedicle screws with rigid rods; (4) Type 4, interbody fusion cage plus Type 2; (5) Type 5, Type 1 plus Type 2. Flexion/extension of 10 Nm with a compressive follower load of 400N was applied. As compared to the Type 3 (62~65%) and Type 4 (59~62%), Type 5 (53~55%) was able to limit the motion at the operated level effectively, despite moderate reduction at the adjacent level. It was also able to shift the load back to the anterior portions of the spine thus relieving excessively high posterior load transfer and to reduce stress on the endplate by absorbing the load with its flexible shape design features. The likelihood of component failure of flexble cage remained less than 30% regardless of loading conditions when combined with pedicle screws with flexible rods. Our study demonstrated that flexible cages when combined with posterior dynamic system may help reduce subsidence of cage and degeneration process at the adjacent levels while effectively providing stability at the operated level.
목차
등록된 정보가 없습니다.
참고문헌 (20)
참고문헌 신청
A.S. Hilibrand / 1999 / Degenrative lumbar stenosis:Diagnosis and management / J Am Acad Orthop Surg 7 (4) : 239 ~ 249
D. C. Kim / 2009 / Preliminary report on usefulness of adjacent interpinous stabilization using interspinous spacer combined with posterior lumbosacral spinal fusion in degen
D. H. Chow / 1996 / Effects of short anterior lumbar interbody fusion on biomechanics of neighboring unfused segment / Spine 21 : 549 ~ 555
D.S Brodke / 2003 / Anterior thoracolumbar instrumentation: Stiffness and load sharing characteristics of plate and rod systems / Spine 28 (16) : 1794 ~ 1801
K.C. Choi / 2013 / Biomechanical comparison of anterior lumbar interbody fusion: stand-alone interbody cage versus interbody cage with pedicle screw fixation - a finite eleme
D. C. Kim / 2009 / Preliminary report on usefulness of adjacent interpinous stabilization using interspinous spacer combined with posterior lumbosacral spinal fusion in degen
D. H. Chow / 1996 / Effects of short anterior lumbar interbody fusion on biomechanics of neighboring unfused segment / Spine 21 : 549 ~ 555
D.S Brodke / 2003 / Anterior thoracolumbar instrumentation: Stiffness and load sharing characteristics of plate and rod systems / Spine 28 (16) : 1794 ~ 1801
K.C. Choi / 2013 / Biomechanical comparison of anterior lumbar interbody fusion: stand-alone interbody cage versus interbody cage with pedicle screw fixation - a finite eleme
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