Ankylosing spondylitis (AS), currently grouped under the term axial spondyloarthritis (axSpA), is a chronic form of arthritis that causes inflammatory back pain and can gradually result in impaired spinal mobility. It can also cause eye inflammation (uveitis), arthritis of limb joints, inflammation at sites of bony attachments of tendons and ligaments (enthesitis), and associated psoriasis and inflammatory bowel disease. No cure has yet been found;...