The assessment of the spondyloarthritis international society concept and criteria for the classification of axial spondyloarthritis and peripheral spondyloarthritis: A critical appraisal for the pediatric rheumatologist

Table 6 Estimated prevalence of each of the items listed in the Assessment of Spondyloarthritis International Society classification criteria for axial and peripheral spondyloarthritis in the different categories of juvenile onset disease in children and adolescents*

	Ankylosing spondylitis	Undifferentiated spondyloarthritis	Enthesitis related arthritis	Psoriatic spondyloarthritis	Psoriatic arthritis not related to spondyloarthritis
Sacroiliitis on MRI	+++	+	+	+	-
Sacroiliitis on X-rays	++++	-	+	+	-
Inflammatory back pain	++++	+	+	+	-
Arthritis	++++	++++	++++	++++	++++
Enthesitis (heel pain)	+++	+++	+++	++	-
Uveitis	++	+	+	+	-
Dactylitis	+	++	++	++	+++
Psoriasis	+	-	-	++++	++++
Crohn’s/colitis	+	-	-	+	-
Good response to NSAIDs	+++	NA	NA	NA	NA
Family history for SpA	++	+	+	++	-
HLA-B27	+++	++	++	++	-
Elevated C reactive protein	+++	+++	+++	+++	++
Previous infection	+	-	-	-	-

*Based on the literature and on the opinion of local experts in the care of these children.
The presence of such items excludes the undifferentiated spondyloarthritis and enthesitis related arthritis as diagnosis.
MRI = magnetic resonance imaging. NSAIDs = Non-Steroidal Antinflammatory Drugs. NA = data not available. SpA = Spondyloarthritis.

ISSN: 1546-0096