Effect of open door Angle on volume expansion in open-door laminoplast
Objective To determine the optimal opening Angle(OA)for posterior cervical open-door lami-noplasty(PCOL)in patients with multilevel cervical spondylotic myelopathy(CSM).Methods The three-dimen-sional model of cervical spine was used to simulate PCOL,and the volume and proportion of vertebral canal expan-sion under different OA were calculated,as well as the expansion ratio increase.At the same time,the sagittal diam-eter of spinal canal after PCOL was measured in traditional two-dimensional plane.Results With the increase of OA,the enlarged volume and the dilatation ratio of the spinal canal increase significantly.When OA was 30°,the dilatation effect obtained by three-dimensional measurement was the best,while when OA was 60°,the dilatation ef-fect obtained by two-dimensional measurement was the best.In addition,when OA was 30° and 60°,the expansion ratio and expansion ratio increased the most,and had statistical significance(P＜0.05).Conclusion There is a close relationship between the OA and the expansion volume of the cervical canal.The expansion effect is best when the OA is 30°calculated by three-dimensional measurement method,while the expansion effect is best when the OA is 60° calculated by two-dimensional measurement method.
NETL
NSTL
万方数据
