Arrow shows LSS, narrowing of the spinal canal causing nerve compression.

Lumbar spinal stenosis (LSS) occurs when the spine is narrowed. This causes compression of the collection of nerves below the spinal cord. This collection of nerves is called the cauda equina, and compression may result in numbness or weakness of the lower extremities. Bladder and bowel troubles may also result from this disorder. The most common result is difficulty walking and most patients note trouble walking distances.

LSS is generally a degenerative condition but may also occur from injuries to the spine, narrowing which has been present since birth, disc rupture, tumors, and other disorders of the lumbar spine. Treatment is designed to relieve the compression of the nerves. In the case of degenerative problems, we have a federally-funded study designed to examine the result of a specially-designed course of physical therapy or surgery. The surgery is performed to relieve compression of nerves by removing bone, ligament and disc material as necessary. Spinal instability rarely occurs as a result of the condition or surgery, and spinal fusion is sometimes necessary.

The general result of the surgery is that 70% of patients report a resolution or improvement in their symptoms.