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- Author or Editor: Marcel Marcoux x
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Summary
Radiographs of all 4 fetlocks of 71 Standardbred racehorses were obtained at 3-month intervals for 1 year. Radiographic findings in the abaxial surface of the proximal sesamoid bones were classified into 3 types according to the severity of lesions, and correlation was made with clinical findings at time of examination. Type-1 lesions (1 or 2 linear defects ≤ 1 mm wide) were detected in 55% of horses at the start of training; clinical signs of disease were not manifested, and lesions did not become clinically relevant.
Type-2 lesions (3 or more linear defects ≤1 mm wide) were detected in horses not manifesting clinical signs of disease, and were more frequently observed after 3 months of training. However, 66% of horses affected with diseases of the suspensory apparatus, including superficial flexor tendinitis and suspensory desmitis, also manifested this type of lesion. When lameness was observed, it was associated with the soft tissue problem, and the sesamoid bone changes were considered secondary.
Type-3 lesions (wide, abnormally shaped linear defects) were detected in 7 horses at the start of the study; lesions remained in horses throughout the study and were consistently associated with lameness during training. Type-3 lesions were considered clinically relevant and indicative of primary sesamoiditis.
Summary
The effect of triamcinolone acetonide (0.09 mg/kg of body weight, im) on serum osteocalcin concentration was studied. Two groups of horses were investigated and included clinically normal horses (group 1, n = 5) and horses with chronic obstructive pulmonary disease (group 2, n = 5). Before treatment, results of a t-test did not reveal any significant difference in serum osteocalcin concentration between the 2 groups. After treatment, a significant (P < 0.05) decrease in serum osteocalcin concentration was observed for both groups. Osteocalcin concentration in individual horses reached a minimum by 24 to 48 hours after treatment. In both groups of horses, serum osteocalcin response to glucocorticoid administration was similar. In 7 of 10 horses, return to pretreatment values was observed after 28 days. Pretreatment values for the other 3 horses were reached between 62 and 150 days.
