Schönström N, Lindahl S, Willén J, Hansson T
Department of Orthopaedic Surgery, Sahlgren Hospital, University of Göteborg, Sweden.
J Orthop Res. 1989;7(1):115-21. doi: 10.1002/jor.1100070116.
The variation in the dimensions of the lumbar spinal canal under both flexion-extension and axial compression-distraction was studied using computerized tomography (CT) scans in human cadaver lumbar spine specimens. In 3-mm-thick CT slices through the disk at L3-L4, the cross-sectional area of the spinal canal was reduced by around 40 mm2, corresponding to a 16% reduction of the initial area when the lumbar spines were moved both from flexion to extension and from distraction to compression. A corresponding reduction in the midsagittal diameter of the canal of 2 mm was found. During these motions, the ligamentum flavum did not appear to be a significant factor for the dynamic changes affecting the dimensions of the canal. This held true even after the disk had been excised in order to produce a total collapse of the disk space.
利用计算机断层扫描（CT）对人体尸体腰椎标本进行扫描，研究了腰椎管在屈伸和轴向压缩-牵张时的尺寸变化。在L3-L4椎间盘处3毫米厚的CT切片中，当腰椎从屈曲到伸展以及从牵张到压缩时，椎管的横截面积减少了约40平方毫米，相当于初始面积减少了16%。同时发现椎管矢状径相应减少了2毫米。在这些运动过程中，黄韧带似乎并不是影响椎管尺寸动态变化的重要因素。即使在切除椎间盘以使椎间盘间隙完全塌陷后，情况依然如此。
