How is tenosynovitis presence useful in the differential diagnosis of polyarticular symptoms?
Tenosynovitis is inflammation of the synovial-lined sheaths surrounding tendons in the wrists, hands, ankles, and feet. Physical examination usually reveals tenderness and swelling along the track of the involved tendon between the joints. It is a characteristic feature of RA, gout, reactive arthritis, psoriatic arthritis, gonococcal arthritis, and tuberculous and fungal arthritis. It is distinctly uncommon in other causes of polyarticular disease.