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- W2366280506 abstract "Objective To investigate different lumbar fusion methods and fatigue loading in the management of instability of lower lumbar spine biomechanically in vitro.Methods A total of nine fresh human cadaver specimens from lumbar 1 to sacrum were used in this study. Each intact lumbar spine was tested in flexion-extension, lateral bending and axial rotation on a modeified testing machine with 8.0 Nm pure moment. After testing the intact lumbar spine, the L 4-5 segment instability were created by L 4 laminectomy, partial facet joint resection and discectomy. The L 4-5 functional spinal unit was then stabilized by three methods: segment pedicle screw fixation with CD implant; CD implant combined with intervertebral body strut bone graft (CD-graft) or TFC (CD-TFC). The range of motion (ROM) were determined in three dimension by stereophotogrammetry. After testing that order, 1 500 cycle fatigue loading were applied by 868 Mini-MTS, the ROM of L 4-5 were determined again by stereophotogrammetry.Results By resecting L 4 laminar, partial L 4-5 facet joint resecting and discectomy, the ROM of L 4-5 were increased significantly in all six motions. Compared with the intact lumbar spine, ROM were significantly reduced in flexion-extension by CD implant, but there were no significant changes in lateral bending and axial rotation. Both CD-graft and CD-TFC yielded high valves for stiffness in flexion-extension, lateral bending and axial rotation compared with the intact lumbar spine, even after fatigue loading test, and the ROM of L 4-5 did not increase significantly. The ROM of L 4-5 in axial rotation with CD-TFC was smaller than that with CD-graft. Conclusion All of CD implant, CD-graft and CD-TFC may provide instant stability of L 4-5. CD implant did not maintain L 4-5 segment stability after fatigue loading, but CD-graft and CD-TFC had still kept L 4-5 segment stability after fatigue loading. L 4-5 segment with CD-TFC was much stable in resisting axial rotation compared with CD-graft." @default.
- W2366280506 created "2016-06-24" @default.
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- W2366280506 date "2002-01-01" @default.
- W2366280506 modified "2023-09-22" @default.
- W2366280506 title "Different Lumbar Fusion Methods for Management of Instability ofLower Lumbar Spine: A Biomechanical Study in Vitro" @default.
- W2366280506 hasPublicationYear "2002" @default.
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