Influence of trauma on the development of chronic inflammatory polyarthritis.

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Abstract
Details are presented of 3 patients in whom trauma to the proximal interphalangeal joint of a middle finger was followed by chronic arthritis with prominent involvement of the injured joint. Two of the patients developed generalized sero-positive rheumatoid disease. In the third the arthropathy was probably psoriatic and remained confined to the joints of the injured finger. Trauma therefore appeared to play a significant part in determining the pattern of arthritis.