Lumbar Laminectomy Procedure, Posterior View

Description

Lumbar vertebrae are presented from a posterior approach with the midline posterior elements opened to illustrate a laminectomy. The spinous process and adjacent laminae have been removed at one or more lumbar levels, exposing the roof of the vertebral canal where the ligamentum flavum normally bridges between laminae. Medial portions of the facet joints and the pars interarticularis remain laterally, orienting the viewer to the relationship between the decompressed central canal and the posterior articular complex. Bone edges at the laminar margins define the surgical window. Midline decompression is the focus. Lumbar laminectomy is performed most often for degenerative lumbar spinal stenosis, where hypertrophied ligamentum flavum, facet arthrosis, and spondylotic change narrow the canal and compress the cauda equina or traversing nerve roots, producing neurogenic claudication or radiculopathy. By emphasizing the posterior arch and the canal immediately deep to it, the illustration clarifies what is removed versus what is preserved, a distinction that matters when discussing iatrogenic instability, postoperative spondylolisthesis risk, and the rationale for adding a fusion when extensive facetectomy is planned. The fixed posterior perspective also supports teaching safe bony boundaries around the dura mater and epidural space. Use this illustration in spine surgery texts, operative technique manuals, and informed-consent materials that need a straightforward depiction of posterior lumbar decompression. It also fits gross anatomy and neurosurgical teaching sessions when contrasting laminectomy with laminotomy and when mapping symptoms to central canal stenosis at L3 to L5. Anatomical accuracy verified by SciePro's Medical Advisory Board.