It is a group of diseases in which inflammatory arthritis characterized by a persistently negative test for rheumatoid factor (RF) is variably associated with a number of other common articular, extra-articular & genetic features.
These disorders develop usually before age 40.
Inflammation of spine, or large peripheral joints, uveitis, and absence of autoantibodies and striking association
with HLA B-27 are characteristics of this group.
• Ankylosing spondylitis.
• Reactive arthritis (Reiter’s syndrome).
• Psoriatic arthritis associated with psoriasis
• Enteropathic arthritis associated with
ulcerative colitis and Crohn’s disease
• Bechet’s (Beshets) syndrome
• Juvenile chronic arthritis.