• Articular and periarticular calcification Only involving 1 or 2 joints
• Discrete areas of low signal intensity within the articular cartilage
More apparent on GRE sequences
• Relative joint space preservation • Erosions with overhanging edges
A gradually expanding tophus eroding at the bone cortex with concomitant new periosteal bone formation trying to contain the tophus
• Asymmetric polyarticular distribution
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X-RAY
• Chronicity of the disease process • Only 45％,only 6-8 years • “Punched out”
Until 6–12 years after the initial acute attack
• Accounting for 3-7％ in panarthritis • Men＞40 years old • Genetic predisposition
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Background
• Most classically in the first metatarsophalangeal joint (toe)
• The presence of structural changes in radiographs correlates with poor function, and is associated with irreversibility of changes.
