The Pattern of Juvenile Idiopathic Arthritis in a Single Tertiary Center in Saudi Arabia
Table 1
The ILAR classification of JIA.
Systemic arthritis
Arthritis with, or preceded by, daily fever of at least 2-week duration that is documented to be daily for at least 3 days and accompanied by one or more of the following: (i) evanescent, nonfixed, erythematous rash; (ii) generalized lymph node enlargement; (iii) hepatomegaly and/or splenomegaly; (iv) serositis Exclusion criteria: A, B, C, and D
Oligoarthritis
Arthritis in 1–4 joints during the first 6 months of disease. Two subtypes: (i) persistent oligoarthritis affects no more than four joints throughout the disease course; (ii) extended oligoarthritis affects a total of more than four joints after the first 6 months of disease Exclusion criteria: A, B, C, D, and E
Polyarthritis (RF-negative)
Arthritis affecting 5 or more joints during the first 6 months of disease: tests for RF are negative Exclusion criteria: A, B, C, D, and E
Polyarthritis (RF-positive)
Arthritis in 5 or more joints during the first 6 months of disease: tests for RF are positive Exclusion criteria: A, B, C, and E
Psoriatic arthritis
Arthritis plus psoriasis or arthritis plus at least two of the following: dactylitis, nail pitting, or onycholysis, psoriasis in a first-degree relative Exclusion criteria: B, C, D, and E
Enthesitis-related arthritis
Arthritis plus enthesitis or arthritis or enthesitis, plus at least two of the following: presence of or a history of sacroiliac joint tenderness and/or inflammatory lumbosacral pain, presence of HLA-B27 antigen, onset of arthritis in a male over 6 years of age, acute (symptomatic) anterior uveitis, history of AS, ERA, sacroiliitis with IBD, reactive arthritis, or acute anterior uveitis in a first-degree relative Exclusions criteria: A, D, and E
Undifferentiated arthritis
Arthritis that do not fulfill criteria in any of the above categories or fulfills criteria in two or more of the above categories
