Ankylosing spondylitis, spondyloarthritis and related disease information, education and support. Ankylosing spondylitis and spondyloarthritis symptoms, diagnosis, treatment, medication, educational materials, brochures. Axial spondyloarthritis and ankylosing spondylitis patient support, message boards, physician resources and more. SAA is a non-profit organization and we were the first and remain the largest resource for people affected by spondylitis in the United States.