Criteria for juvenile arthritis: onset before 16th birthday
Method 1 - all of the following:
(1) arthritis
(2) enthesitis
(3) none of the following:
(3a) presence of psoriasis in a first or second degree relative, confirmed by a dermatologist
(3b) presence of a systemic arthritis
Method 2 - all of the following:
(1) arthritis OR enthesitis
(2) :two or more of the following
(2a) sacroiliac joint tenderness AND/OR inflammatory spinal pain
(2b) presence of HLA-B27
(2c) family history involving one or more first or second degree relatives with an HLA-B27 related disease, confirmed by a physician
(2d) anterior uveitis (typically with pain, redness and/or photophobia)
(2e) onset of arthritis in a boy > 8 years of age
(3) none of the following:
(3a) presence of psoriasis in a first or second degree relative, confirmed by a dermatologist
(3b) presence of a systemic arthritis
where:
• Inflammatory spinal pain involves pain in the spine at rest, with morning spinal stiffness that improves with activity.
Additional descriptors:
(1) age of onset of arthritis and/or enthesitis
(2) pattern of arthritis at 6 months after disease onset (large vs small joint, limb predominance, specific joint)
(3) asymmetry of arthritis
(4) oligoarthritis vs polyarthritis
(5) presence of inflammatory bowel disease
