See notes below
These criteria are applicable to patients with peripheral arthritis compatible with SpA (usually asymmetric and/or predominant involvement of the lower limb), and/or enthesitis and/or dactylitis.
Additional SpA Features
IBP in the past: IBP in the past according to the rheumatologist’s judgement
Arthritis: Past or present peripheral arthritis compatible with SpA (usually asymmetric and/or predominant involvement of lower limb)
Enthesitis: Past or present spontaneous pain or tenderness at examination of an enthesis
Uveitis: Past or present uveitis anterior, confirmed by an ophthalmologist
Dactylitis: Past or present dactylitis, diagnosed by a doctor
Psoriasis: Past or present psoriasis, diagnosed by a doctor
IBD: Past or present Crohn’s disease or ulcerative colitis diagnosed by a doctor
Preceding infection: Urethritis/cervicitis or diarrhoea within 1 month before the onset of arthritis/enthesitis/dactylitis.
Family history for SpA: Presence in fi rst-degree (mother, father, sisters, brothers, children) or second-degree (maternal and paternal grandparents, aunts, uncles, nieces and nephews) relatives of any of the following: (1) ankylosing spondylitis, (2) psoriasis, (3) acute uveitis, (4) reactive arthritis, (5) IBD
HLA-B27: Positive testing according to standard laboratory techniques
Sacroiliitis by imaging: Bilateral grade 2–4 or unilateral grade 3–4 sacroiliitis on plain radiographs, according to the modified New York criteria, or active sacroiliitis on MRI according to the ASAS consensus definition