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Intra-articular corticosteroid- and exercise-induced arthropathy in a horse.

Methylprednisolone acetate was injected repeatedly into both intercarpal joints of a horse that had a 3rd carpal bone fracture in 1 limb. Synovial fluid from intercarpal and radiocarpal joints of both limbs were obtained serially for study. Arthropathy developed in the fractured joint following prolonged corticosteroid therapy and exercise. In the corticosteroid-injected normal joint, the hyaluronic acid concentration initially decreased, then increased. A depletion in cartilage matrix was seen at necropsy, 175 days after onset of treatment. Determination of total protein content in synovial fluid gave the earliest indication of impending arthropathy, but viscosity studies in association with determination of hyaluronic acid concentration gave a definitive assessment of joint integrity.