Post laminectomy syndrome, also called failed back syndrome, is a syndrome characterized by persistent, chronic pain following back surgery. It is most commonly associated with laminectomy surgeries, a procedure that removes part of the vertebral bone. The goal of the surgery is to trim the lamina to widen the spinal canal. The procedure is often done on patients with spinal stenosis, and the goal is to relieve pressure on the nerves and create more room for the thecal sac. While some pain after surgery is common, post laminectomy syndrome is diagnosed when severe pain persists for several months following surgery, or more pain is experience following the surgery.