△ 后方长度 LCC(length of the cervical cord,颈髓长度):C1前后弓上缘延脊髓边缘与C7下终板连线之间的长度
颈椎不同体位脊髓长度 (伸展位<中立位<屈曲位)
各节段不同位置颈髓矢状径平均值 (伸展位>中立位>屈曲位) 3.动力位脊髓有效空间的变化
颈髓有效空间(cervical cord available space ,CCAS)的变化:伸展位明显变小(与后方黄韧带折叠等相关)C3和C6屈曲位的颈髓有效空间明显大于中立位和伸展位。中立位和屈曲位的各节段颈髓有效空间无明显差异。 参考文献[1] Lei Z , Zeitoun D , Rangel A , et al. Preoperative evaluation of the cervical spondylotic myelopathy with flexion-extension magnetic resonance imaging: about a prospective study of fifty patients.[J]. Spine, 2011, 36(17):1134-9.[2] Schatlo B , Remonda L , Gruber P , et al. Cervical Spine Prospective Feasibility Study[J]. Clinical Neuroradiology, 2018.[3] Scheer J K , Tang J A , Smith J S , et al. Cervical spine alignment, sagittal deformity, and clinical implications: a review.[J]. J Neurosurg Spine, 2013, 19(2):141-159.[4] Badhiwala J H , Ahuja C S , Akbar M A , et al. Degenerative cervical myelopathy — update and future directions[J]. Nature Reviews Neurology, 2020, 16(2):108-124.