Anatomical features of the spinal canal in degenerative lumbar scoliosis and its correlation with spinal-pelvic parameters
Objective To analyze the change pattern and its correlation with spinal-pelvic parameters by measuring morphological parameters of the spinal canal in patients with degenerative lumbar scoliosis(DLS).Methods Fifty cases of DLS patients were collected.Cobb angle of lumbar bending,anterior lumbar convexity angle,position of the parietal vertebra,distance of parietal offset,rotation of the parietal vertebra,distance of lateral and anterior slip of the parietal vertebra,pelvic parameters PI,PT,SS,height,width and cross-sectional area of the intervertebral foramen on the concave and convex sides,cross-sectional area of the dural sac,transverse diameter and anterior-posterior diameter were measured on X-ray,CT and MRI,respectively.The patterns of morphological changes in the spinal canal and their correlation with spinal-pelvic parameters were analyzed.Results The parietal vertebra of DLS patients were located in the L2～L3 vertebra.The lowest spinal canal parameters were located at L4/5 level,the lowest intervertebral foramen parameters were located at L2,3 level.Morphological parameters of the spinal canal and intervertebral foramen at the L2/3 level correlated with age,cobb angle of lumbar bending,and distance of parietal offset in patients with DLS(P＜0.05);while morphological parameters of the intervertebral foramen at the L5/S1 level were correlated with PI and SS(P＜0.05).Conclusions The most narrowed spinal canal in DLS patients is mostly located at the L4/5 segment,while the most narrowed intervertebral foramen is mostly located at the L2/3 segment.There is a correlation between the degree of spinal canal stenosis and foraminal stenosis in the parietal region and spinal-pelvic parameters.
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