Objective To measure the anatomical parameters of lumbar laminae interval space with lower lumbar disc herniation (LDH) by an imaging method and to explore the clinical significance in minimally invasive spinal surgery. Methods One hundred and forty-five anteroposterior X-ray films with single lumbar disc herniation (L4/5 and L5/S1) were enrolled. The morphological characteristics of the lumbar vertabral laminae interval space between affected side (a symptoms group) and healthy side (a control group) were compared. The height, width and the area of the bilateral vertebral laminae interval space in the segments of L4/5 and L5/S1 were measured by X-rays according to the gender. The available diameter of lumbar laminae interval space was measured by lumbar vertebra 3D CT. Then all data were analyzed statistically. Results From the anteroposterior X-ray films of lumbar laminae interval space, the shape of the vertebral laminae interval space in the segments of L4/5 and L5/S1 in the healthy side group was oval, while the shape in the affected side group were in triangle and oblate shapes. The incidence of lumber disc space stenosis in the affected side group was 68.1% in total, including 65.1% happened in L4/5 segment and the incidence of L5/S1 segment was 71%. With the changing in the width of lumbar laminae interval space, the height also changed. The 3D CT result showed that the available diameter of the vertebral laminae interval space in 76.5% of the patients was smaller than the diameter of the working channel. 72.3% of which were located in the L4/5 segment, and 80.6% in the L5/S1 segment. The mean height, width and the area as well as available diameter of the lumbar vertebral laminae interval space in male group were higher than those in female group, and the difference was statistically significant (P<0.05). The average height, width and the area as well as the available diameter in segment L5/S1 were larger than those in segment L4/5. Conclusions There was a closed association between lumbar disc herniation and the change of lumbar laminae interval space. With the understanding of the height, width, the area and available diameter of the lumbar vertebral laminae interval space would guide to select the minimally invasive surgical approach and the surgical procedure.
Key words
Lumbar disc herniation /
Lumbar laminae interval space /
Minimally invasive spinal surgery /
Anatomical parameters
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