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Criteria

ILAR classification

The ILAR classification divides juvenile idiopathic arthritis into seven exclusive categories by joint pattern and associated features, based on the second revision agreed in Edmonton in 2001.

classification of childhood arthritis

Also called: International League of Associations for Rheumatology, ILAR criteria

Criteria not met

4 inclusion + 2 systemic, or 4 inclusion + 1 oligo, or 4 inclusion + 2 poly neg, or 4 inclusion + 2 poly pos, or 4 inclusion + 2 psoriatic, or 4 inclusion + 2 era, or 3 inclusion + 1 undifferentiated

Inclusion criteria for all categories
Systemic arthritis
Oligoarthritis
Polyarthritis, rheumatoid factor negative
Polyarthritis, rheumatoid factor positive
Psoriatic arthritis
Enthesitis-related arthritis
Undifferentiated arthritis

Educational use only. Guideline: Second revision (Edmonton 2001), published 2004. Source: Petty RE, Southwood TR, Manners P, et al. International League of Associations for Rheumatology classification of juvenile idiopathic arthritis: second revision, Edmonton, 2001. The Journal of Rheumatology. 2004. https://www.jrheum.org/content/31/2/390; Juvenile Idiopathic Arthritis (JIA). Merck Manuals Professional Edition. 2025. https://www.merckmanuals.com/professional/pediatrics/rheumatologic-disorders-in-children/juvenile-idiopathic-arthritis-jia.

Card id: ilar-classification-classification-of-childhood-arthritis

Sources

  • Petty RE, Southwood TR, Manners P, et al. International League of Associations for Rheumatology classification of juvenile idiopathic arthritis: second revision, Edmonton, 2001. The Journal of Rheumatology. 2004. https://www.jrheum.org/content/31/2/390
  • Juvenile Idiopathic Arthritis (JIA). Merck Manuals Professional Edition. 2025. https://www.merckmanuals.com/professional/pediatrics/rheumatologic-disorders-in-children/juvenile-idiopathic-arthritis-jia

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