Can spinal manipulation help correct severe spinal stenosis?

Correct-no. Spinal manipulation cannot correct the problem. However, chinese medicine, acupuncture, and diet changes can help improve symptoms and even reverse some of the damage over time. Research upper cervical chiropractic care as well as crainosacral therapy. As adjuncts they can help improve flow of spinal fluid and blood to the area.
No. Manipulation cannot reverse the bony enlargement of the joints in the spine that cause stenosis.
No, but surgery can. Surgery sucess at relieving leg pain is in the low 90's% chiropratic care can't enlarge the spinal canal in a lasting way.