Aita I, Hayashi K, Wadano Y, Yabuki T
University of Tsukuba, Ibaraki, Japan.
J Bone Joint Surg Br. 1998 Jan;80(1):33-7. doi: 10.1302/0301-620x.80b1.7919.
We performed CT myelography in 38 patients with cervical myelopathy before and after laminoplasty to enlarge the canal. The sagittal and transverse diameters, the cross-sectional area, and the central point of the spinal cord were measured. After cervical laminoplasty, the mean sagittal diameter of the spinal cord at C5 increased by 0.8 mm, but the mean transverse diameter decreased by 0.9 mm. The mean cross-sectional area of the cord increased by 7.4% and that of the dural sac and its contents by 33.8% at C5. The centre of the spinal cord moved a mean 2.8 mm posteriorly at this level. Enlargement of the spinal canal is sufficient to decompress the spinal cord, but posterior movement may be the limiting factor in determining the decompressive effect of laminoplasty.
我们对38例颈椎病患者在椎板成形术前后进行了CT脊髓造影，以扩大椎管。测量了脊髓的矢状径和横径、横截面积以及脊髓中心点。颈椎椎板成形术后，C5水平脊髓的平均矢状径增加了0.8mm，但平均横径减少了0.9mm。C5水平脊髓的平均横截面积增加了7.4%，硬脊膜囊及其内容物的平均横截面积增加了33.8%。在此水平，脊髓中心平均向后移动了2.8mm。椎管扩大足以使脊髓减压，但向后移动可能是决定椎板成形术减压效果的限制因素。
