Effects of unilateral graded facetectomy on lumbar spinal stability / 第三军医大学学报

ABSTRACT

Objective To study the effects of unilateral graded facetectomy on lumbar spinal stability in biomechanics and to investigate the biomechanical characteristics of articular process and the safety of decompression produre for lumbar disc herniation.Methods The vertebral column L4/5 function spinal unit(FSU) of 5 adult cadavers was used and graded facetectomy was performed on left articular process of L4/5 resulting in 0,1/4,1/2,3/4,4/4 facetectomy of lateral small vertebral joints.The stability of each model was determined using three-dimension movement test machine of vertebral column.Results When more than 1/2 facetectomy of lateral small vertebral joints was carried out,the circuitation stability of left,right lateral flexion and the left,right axial direction of vertebral column and that of normal vertebral column had significant difference(P