Juvenile idiopathic arthritis x ray

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Dheeraj Makkar, M.D.[2]

Juvenile idiopathic arthritis Microchapters
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Radiographic (X-ray) Findings

Plain radiography is commonly used in the evaluation of juvenile idiopathic arthritis (JIA) to assess joint involvement, monitor disease progression, and identify structural damage, although early disease may show minimal changes.

Early Findings

• Soft-tissue swelling
• Joint effusion
• Periarticular osteopenia due to hyperemia and disuse
• Widened joint spaces in early disease related to cartilage hypertrophy in growing children

Progressive and Chronic Findings

• Joint space narrowing reflecting cartilage loss
• Marginal and central erosions in longstanding disease
• Subchondral sclerosis and cyst formation
• Joint deformity and malalignment
• Growth abnormalities, including limb-length discrepancy and epiphyseal overgrowth or premature closure

Subtype-Specific Features

• Oligoarticular JIA: Changes often limited to a few large joints, commonly the knee
• Polyarticular JIA: Symmetric erosive changes resembling adult rheumatoid arthritis, particularly in RF-positive disease
• Systemic JIA: Radiographic findings may develop later, often following a period of predominant systemic inflammation

Radiographic findings should be interpreted alongside clinical features and laboratory results, as normal radiographs do not exclude active inflammatory disease in early JIA.