Ankylosing spondylitis - signs and symptoms, Schober test, Faber test, imaging, treatment

Ankylosing Spondylitis is a chronic seronegative autoimmune spondyloarthropathy characterized by bridging spinal osteophyte formation, enthesitis, sacroiliitis, and uveitis.
Diagnosis is made with the presence of HLA-B27 antigens, the presence of bilateral sacroiliitis, and ocular examination to assess for uveitis.
Treatment is observation, NSAIDs, and physical therapy for mild symptoms. Surgical management is indicated for unstable spinal fractures, progressive deformity, and the presence of neurological deficits.