Bilateral Destructive Hip Disease from Untreated Juvenile Idiopathic Arthritis

Table 1

Six categories and definitions of juvenile idiopathic arthritis [2].

Categories of juvenile idiopathic arthritis	Definitions
Systemic arthritis	Arthritis in one or more joints with or preceded by fever ≥ 2 weeks’ duration and accompanied by one or more of the following: (1) Evansecent (nonfixed) erythematous rash; (2) Generalized lymph node enlargement; (3) Hepatomegaly and/or splenomegaly; (4) Serositis
Psoriatic arthritis	Arthritis and psoriasis or arthritis and ≥2 of the following: (1) Dactylitis; (2) Nail and pitting or onycholysis; (3) Psoriasis in a first-degree relative
Enthesitis-related arthritis	Arthritis and enthesitis or arthritis or enthesitis with ≥2 of the following: (1) Presence of or a history of sacroiliac joint tenderness and/or inflammatory lumbosacral pain; (2) Presence of HLA-B27 antigen; (3) Onset of arthritis in a male >6 years of age; (4) Acute (symptomatic) anterior uveitis; (5) History of ankylosing spondylitis, enthesitis-related arthritis, sacroiliitis with inflammatory bowel disease, Reiter’s syndrome, or acute anterior uveitis in a first-degree relative
Oligoarticular	Arthritis affecting 1-4 joints during the first 6 months of disease. Two subcategories: Persistent oligoarthritis: affecting ≤4 joints throughout the disease course; Extended oligoarthritis: affecting >4 joints after the first 6 months of disease
Polyarthritis	Rheumatoid factor negative: arthritis affecting ≥5 joints during the first 6 months of disease; RF test is negative; Rheumatoid factor positive: arthritis affecting ≥5 joints during the first 6 months of disease; 2 or more tests for RF at least 3 months apart during the first 6 months of disease are positive
Undifferentiated arthritis	Arthritis that fulfills criteria in no category or in 2 or more of the above categories