Spinal stenosis is defined simply as the narrowing of the spinal canal. It can be as a result of progressive compression of the spinal nerve roots or spinal cord due to multiple arthritic changes. This can occur anywhere in the spine and typically involves the lumbar spine. Numerous causes for this condition exist. Typical symptoms include hip or leg pain that is generally worse with standing or walking and is usually relieved by sitting down. Activity is therefore usually limited by pain and/or weakness. Depending upon the severity of symptoms non-operative therapy is initially instituted. Exercise therapy, anti-inflammatory medicine, and epidural steroid injections may provide relief. Some patients will require surgery to enlarge the spinal canal and relieve pressure on the spinal nerve roots.