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The case records, radiographs, and nuclear bone scans of 58 horses with stress reactions or stress fractures of the proximal palmar aspect of the third metacarpal bone (MC3) were reviewed. There were 47 Standardbreds, 4 Quarter Horses, 3 Thoroughbreds, 2 Arabians, 1 Oldenburg, and 1 Pony of America. Fifty-six of the horses were racehorses or performance horses. The mean and median ages of affected horses were 4 and 3 years, respectively. Lameness ranged from mild to severe. Physical findings were usually subtle and included signs of pain on deep palpation of the proximal palmar aspect of MC3 and slight effusion of the middle carpal joint in some cases. Lameness was commonly improved by high palmar and palmar metacarpal nerve blocks or anesthesia of the middle carpal joint. Fifty-three horses had higher than normal radiopharmaceutical uptake in the proximal palmar aspect of MC3 in the left or right limb. The other 5 horses had higher than normal radiopharmaceutical uptake bilaterally. Fifty-six of the 63 limbs with abnormal bone scans also had abnormal radiographs. Treatment consisted of a variable period of rest (1 to 6 months). Healing was best assessed by follow-up bone scans. Of the 45 horses for which follow-up information was adequate, 29 (64%) returned to their previous level of performance.  相似文献   
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A five year old American Saddlebred gelding was admitted to the University of Illinois Veterinary Medical Teaching Hospital with a history of multiple leg lameness, depression and intermittent fever for a duration of six months. Physical examination revealed the horse to be underweight, depressed and afebrile. No abnormalities were detected during auscultation of the heart and lungs. All limbs possessed multiple hard swellings of the distal long bones and digits. The horse walked with a stiff gait and was reluctant to trot. Nuclear scintigraphy of the distal limbs revealed multiple areas of focally increased uptake in all limbs. Radiographs of several sites on the distal limbs showed evidence of periosteal new bone production corresponding to the areas of abnormal uptake. The horse was euthanized and at necropsy chronic, multifocal, fibrous pericarditis and epicarditis were observed grossly. The left atrial myocardium contained areas of osseous metaplasia. Histological evaluation of the distal long bones revealed proliferative periosteal new bone formation consistent with a diagnosis of hypertrophic osteopathy.  相似文献   
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