Decompressive laminectomy - This surgery is done to relieve pressure on the spinal cord or spinal nerve roots caused by age-related changes in the spine.
http://www.webmd.com/back-pain/decompressive-laminectomy-for-spinal-stenosis
Wikipedia: Laminectomy - is a spine operation to remove the portion of the vertebral bone called the lamina.
https://en.wikipedia.org/wiki/Laminectomy
