There is deformity, particularly of the distal interphalangeal joints of the fingers and the interphalangeal joint of the thumbs. The joints are narrowed and subluxed with sclerosis and overgrowth of the joint margins. There is some fragmentation of the hypertrophied bone at the joint margins. All the proximal interphalangeal joints and the metacarpo-phalangeal joint of the ring finger show some narrowing. There is no visible erosion and the carpus is spared.
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