Thoracolumbar Spine Anatomy and Pathology - Root Canal
L4 L5 Neuroforamen (Root Canal)
1. The superior articular process of L5 intrudes into the neuroforamen from below like a wedge.
2. The outermost annulus fibrosus is partially ossified and extruded and completely obliterates the lower portion of the foramen.
3. The ligamentum flavum is redundant and thickened and also exerts a mass effect on the root against the unyielding pedicle. Note also the sclerosis adjacent to the endplates and the engorgement of the retrovertebral epidural veinous plexus (see also section 8 and 20).
Professor of Clinical Anatomy
Academic University Hospital
Department of Orthopaedic Surgery
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