... the definition of the BathAnkylosing Spondylitis Disease Activity Index (BASDAI) [21], the Bath Ankylosing Spondylitis Functional Index (BASFI), and the Bath Ankylosing Spondylitis Metrology ... improvement by exercise [9]. In 90% or more cases, the disease starts witha sacroiliitis. Further in the course of the disease, the wholespine can be affected with spondylitis, spondylodisciitis, and arthritis ... follow-up of patients, and for a better understanding of the pathogenesis of this disease, the definitions of new management criteria and outcome criteria by the Assessment in SpondyloArthritisInternational...