Title: The effects of the posterior fusion on the stabilization of lumbar spine in conditions of bilateral graded facetectomy
Abstract: Objectives:To probe the effects of the posterior fusion cage on the stabilization of lumbar spine in conditions of bilateral graded facetectomy.Methods:Six fresh adult cadaver specimens of lumbosacral segments(L1-S5) were used for biomechanical evaluation of posterior fusion cage on stabilization of lumbar spine in conditions of bilateral graded facetectomy.A three-dimensional movement device with the maximum load of 10N.M were applied to produce six kinds of pure moment of force and to create six kinds movement of the lumbar spine in flexion,extension,left and right lateral bendings as well left and right axial rotations.Measurements were done in turn on each specimen for six conditions:intact condition,unstable condition,bilateral medial 1/3 facetectomy with cages,bilateral medial 1/2 facetectomy with cages,bilateral complete facetectomy with cages and bilateral complete facetectomy with cages and TSRH.Analysis of the changes of the range of movement(ROM) in different conditions was performed.Results:Under bilateral medial 1/3,1/2 and complete facetectomy,posterior fusion cage could always significantly decrease the ROM of L4-L5 segment in flexion(4.50 ±2.43,2.61 ±0.82,3.21 ±1.41),left(4.70 ±1.4,3.43 ±0.75,4.13 ±0.81) and right(5.98 ± 2.67,3.89±0.70,4.53±1.33) lateral bendings(P0.01).Bilateral complete facetectomy with cages and TSRH significantly increased the ROM in flexion(1.49±0.58),extension(1.60±0.98),left(1.21±0.34) and right(1.29 ±0.41) lateral bendings as well left(1.60 ±0.87) and right(1.53 ±0.98) axial rotations(P 0.01).Conclusions:Posterior fusion cage can improve the stability of lumbar spine with bilateral graded facetectomy.The stability of lumbar spine will be weakened by resection of the facet.Once the facet resects too much,the transpediclar fixation should be performed to improve the stability of lumbar spine.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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