Originally Posted by SouthernMoss
Tim, there are two different ways of classifying spondyloarthritis. AS in the old classification is radiographic axial spondyloarthritis in the new classification. This link explains the two systems of classification.

Thanks for pointing that out, a lot of the articles I was finding used Axial Spondyloarthitis and Ankylosing Spondylitis in the same sentence as if they were two different conditions.

Still I find it’s interesting that there is a decent enough population of people with a form of AS that does not show on imaging that a Non-Radiographic form of the disease seems to have recently gained some acceptance in the medical community.