Most commonly, laminectomy is performed to treat spinal stenosis

Laminectomy or Laminotomy (a partial laminectomy) is sometimes called a decompression procedure and is a spinal procedure to remove a portion of the vertebral bone called the lamina. The lamina is a posterior arch of the vertebral bone lying between the spinous process, which juts out in the midline and the more lateral of each vertebra. The pair of lamina, along with the spinous process, make up the posterior wall of the bony spinal canal.  Although the procedure indicates excision of the lamina, the operation called conventional laminectomy, removes the lamina, spinous process and overlying connective tissues and ligaments, cutting through the muscles that overlie these structures. Minimal surgery laminectomy is a tissue preserving surgery that leaves the muscles intact, spares the spinal process and takes only one or both lamina. Laminotomy is removal of a mid-portion of one lamina and may be done either with a conventional open technique, or in a minimal fashion with the use of tubular retractors and endoscopes.

BRIEF ABOUT THE PROCEDURE

There are many variations of laminectomy, in the most minimal form small skin incisions are made, back muscles are pushed aside rather than cut and the parts of the vertebra adjacent to the lamina are left intact. After an incision is made in the midline of the neck or back, the muscle is moved away to expose the lamina, which are the bony shingles that overlay the neural (nerve) elements. The lamina can be removed in whole or in part to expose a single nerve root or more of the neural elements as needed. In the case of a lumbar disc herniation, a laminotomy, or partial removal of the lamina is usually sufficient to gain access to the affected nerve root.  The nerve root will usually be visible just beneath the lamina, with a disc herniation underneath it. The nerve root is gently held out of the way with a retractor and the disc herniation can be accessed. The traditional form of laminectomy (conventional laminectomy) excises much more than just the lamina, the entire posterior backbone is removed, along with overlying ligaments and muscles. The usual recovery period is very different depending on which type of laminectomy has been performed: days in the minimal procedure and weeks to months with conventional open surgery. A lamina is removal is done to break the continuity of the rigid ring of the spinal canal to allow the soft tissues within the canal to expand or as one step in changing the contour of the vertebral column, or in order to allow the surgeon access to deeper tissues inside the spinal canal. Conventional open laminectomy often involves excision of the posterior spinal ligament and some or all of the spinous process and facet joint. Removal of these structures, in the open technique, requires cutting the many muscles of the back which attach to them. Laminectomy performed as a minimal spinal surgery procedure, however, allows the bellies of muscles to be pushed aside instead of transected and generally involves less bone removal than the open procedure. The recovery period after laminectomy depends on the specific operative technique; minimally invasive procedures having a significantly shorter recovery period than open surgery. Removal of substantial amounts of bone and tissue may require additional procedures to stabilize the spine, such as fusion procedures and spinal fusion generally requires a much longer recovery period than simple laminectomy. Most commonly, laminectomy is performed to treat spinal stenosis. Laminectomy for Spinal Stenosis Spinal stenosis is the single most common diagnosis leading to any type of spine surgery and laminectomy is a basic part of its surgical treatment. The lamina of the vertebra is removed or trimmed to widen the spinal canal and create more space for the spinal nerves and thecal sac. Surgical treatment that includes laminectomy is the most effective remedy for severe spinal stenosis, however most cases of spinal stenosis are not severe and do not require surgery. When the disabling symptoms of spinal stenosis are primarily neurogenic claudication and the laminectomy is done without spinal fusion, there is generally a very rapid recovery with excellent long term relief. However, if the spinal column is unstable and fusion is required, there is a recovery period of months to more than a year and relief of symptoms is less likely.