A laminectomy, or removal of the lamina, provides access to the inside of the spinal canal, and allows more room to remove a herniated disc or to open up a tight nerve hole (foramen).

If there is a narrow and tight spinal canal (spinal stenosis) that is putting pressure on the nerve sac (dura), then laminectomy will relieve that pressure, and help leg pain that is due to spinal stenosis.