Chapter 163: The Spondyloarthritides
The spondyloarthritides (SpA) are a family of diseases that include ankylosing spondylitis (AS), reactive arthritis (ReA), psoriatic arthritis (PsA), enteropathic arthritis, juvenile-onset SpA, and undifferentiated SpA. More recently, these disorders have been broadly classified as predominantly axial SpA, affecting the spine, pelvis, and thoracic cage, or predominantly peripheral SpA, affecting the extremities. Classification criteria based on these main clinical features have been developed that aide in early identification (Tables 163-1 and 163-2).
|SACROILIITIS ON IMAGING PLUS ≥1 SPA FEATURE||OR||HLA-B27 PLUS ≥2 OTHER SPA FEATURES|
Sacroiliitis on imaging
|Arthritisb Or Enthesitis Or Dactylitis|
One or more of the following SpA features:
OR two or more of the following SpA features:
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