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Skeletal tuberculosis. Two case reports with a delay in diagnosis.

The presence of Mycobacterium tuberculosis in the olecranon simulated a "warm" bursitis. In another case a stiff knee due to osteitis in childhood was treated with an arthrodesis because of a confusing story of new trauma. Reactivation of previously unrecognized oseoarticular tuberculosis followed. Both patients had negative cultures in ordinary medium at the time of the onset of symptoms.