Ankylosing spondylitis :

Memorable features:
Mornig stiffness lasting more than 1 hour in young-age patient and improving with exercise.
Spinal fractures after minimal trauma in young patients rather than older

Diagnostic test :
XRays
CT scanning
Though AS is HLA B27 positive but it is not used as Diagnostic test.
Therapy:
NSAIDs
Physical Therapy
Exercise
Drug Regime :Latest is TNF alpha inhibitors
(Adalimumab,Infliximab,Etanercept-not used for axial disease)