中文摘要：

目的探讨术前影像学参数与术后脊髓漂移程度的相关性。方法收集18例颈椎管狭窄颈椎后路减压融合术患者手术的后的X线片、CT、MRI等资料，测量术前颈椎Cobb角，纵向距离指数（LDI），手术区域头侧与尾侧节段椎管与脊髓矢状释的比值（S／C），颈椎前凸顶点剑C2～C7连线的垂直距离。术后脊髓漂移程度用平均脊髓前间隙（ACS）表示，分析其相关性。结果患者手术区域头侧节段狭窄处椎管与脊髓矢状径的比值（S／C）和术后脊髓漂移程度密切相关（R^2=0．98）。结论测量颈椎管狭窄颈椎后路减压融合术患者术前手术区域头侧节段狭窄处椎管与脊髓矢状径的比值，对预测术后脊髓漂移程度具有指导作用。

英文摘要：

Objective To study the correlation of preoperative radiographic parameters and spinal cord drift after laminectomy and arthrodesis. Methods Preoperative and postoperative radiographs （radiograph,CT and MRI） of 18 patients underwent cervical laminectomy and arthrodesis were reviewed retrospectively. The sagittal alignment,longitudinal distance index, space available for the spinal cord at cephalad or caudad levels, and distance from apex of the lordosis to the C2-C7 vertical line were measured. Results Space available for the spinal cord at the level immediately cephalad to the laminectomized segments was highly correlated to the postoperative spinal cord shift （R^2 =0. 98）. Conclusion The ratio of preoperative relative stenosis at the level directly cephalad to the laminectomized level to the sagittal alignment is an useful indicator for predicting postoperative spinal cord shift in the patients underwent cervical laminectomy and arthrodesis.