Laminectomy

Laminectomy (from Latin lamina — plate and Greek ektome — excision, removal) is a neurosurgical operation performed on the spine, involving the complete excision of the vertebral arch.

The primary aim of this intervention is the physical expansion of the spinal canal to alleviate critical compression of the spinal cord or the nerve roots emanating from it.

Etiology and pathophysiology

Anatomically, the bony vertebral arch encloses the spinal cord posteriorly, performing an essential protective function. However, in cases of severe trauma (comminuted fractures with displacement) or degenerative diseases, the space within the spinal canal may constrict sharply. The pathogenesis of stenosis also involves compensatory hypertrophy of the adjacent ligamenta flava.

During the operation, the surgeon removes the spinous process and both bony laminae of the vertebral arch up to the articular processes. This creates a wide “decompression window” for the dural sac. Resultantly, normal circulation of cerebrospinal fluid and adequate arterial blood supply to the ischemic nerve tissue are promptly restored.

Clinical significance

Laminectomy is the classic gold standard for emergency surgery in the development of acute compression syndrome, such as in cases of post-traumatic epidural hematoma formation. The procedure is also performed to provide direct surgical access to the spinal cord for the removal of intramedullary tumors.

Despite its high clinical efficacy in rescuing nerve functions, the complete removal of the posterior support complex inevitably leads to a reduction in the biomechanical stability of the spinal segment. For this reason, laminectomy in modern traumatology is almost always complemented by a stabilizing phase — transpedicular spondylodesis (fixation of vertebrae with titanium screws).