Spinal stenosis occurs in middle-aged or elderly people.
It may be caused by osteoarthritis , Paget's disease , or as a result of injury that causes pressure on the nerve roots. It occurs in 5 out of 10,000 people. An examination of reflexes of lower extremities reveals asymmetry. Neurologic examination confirms leg weakness and decreased sensation in the legs. An X-ray of the spine shows degenerative changes and narrowed spinal canal.