Effect of axial loading on neural foramina and nerve roots in the lumbar spine.
Effect of axial loading on neural foramina and nerve roots in the lumbar spine.
复制标题
轴向负荷对腰椎神经孔和神经根的影响。
DOI：
10.1148/radiology.176.2.2367657
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发表时间：
1990
期刊：
影响因子：
19.7
通讯作者：
Haughton,VM
中科院分区：
文献类型：
--
作者：
Nowicki,BH;Yu,S;Reinartz,J;Pintar,F;Yoganandan,N;Haughton,VM
一些患者的神经孔因脊柱轴向压迫而严重狭窄的假设尚未通过直接成像技术进行研究。用计算机断层扫描（CT）对腰椎（椎间盘和相邻椎骨）的冷冻尸体运动节段进行成像。将节段解冻并在静水压力机中压缩以模拟轴向载荷，然后将节段冷冻并再次成像。随后用冷冻切片机对运动节段进行切片，并对椎间盘中存在的慢性退行性变化进行分类。比较压迫前后的CT图像，并研究解剖关系。在41个随机选择的节段中（有些节段先前存在径向、横向和同心环形撕裂），压缩减小了椎管和神经孔的直径和横截面积。在任何情况下，神经根移位，扭曲，或压缩轴向负荷。这项研究表明，即使存在慢性退行性椎间盘变化，轴向载荷（例如普通承重产生的载荷）也不会严重损害神经孔。
The hypothesis that the neural foramina in some patients are critically narrowed by axial compression of the spine has not been studied with direct imaging techniques. Frozen cadaveric motion segments of the lumbar spine (intervertebral disk and contiguous vertebrae) were imaged with computed tomography (CT). The segments were thawed and compressed in a hydrostatic press to simulate axial loading, and then the segments were frozen and imaged again. The motion segments were subsequently sectioned with a cryomicrotome, and the chronic degenerative changes present in the disks were classified. Pre- and post-compression CT images were compared, and anatomic relationships were studied. In 41 randomly selected segments (some with preexisting radial, transverse, and concentric annular tears), compression diminished the diameters and cross-sectional areas of the spinal canal and neural foramina. In no cases were nerve roots displaced, distorted, or compressed by axial loading. This study suggests that axial loading, such as that produced by ordinary weight bearing, does not critically compromise the neural foramina even in the presence of chronic degenerative disk changes.