Association between long periods without high-speed ...



Title Association between long periods without high-speed workouts and risk of complete humeral or pelvic fracture in Thoroughbred racehorses: 54 cases (1991-1994)
Author(s) T. K. Carrier, L. Estberg, S. M. Stover, I. A. Gardner, B. J. Johnson, D. H. Read, A. A. Ardans
Journal Journal of the American Veterinary Medical Association
Date 1998
Volume 212
Issue 10
Start page 1582
End page 1587
Abstract Thoroughbred racehorses in California that were destroyed because of a complete humeral or pelvic fracture were investigated to determine whether a two-month or longer period without official high-speed workouts (lay-up) is associated with humeral or pelvic fracture. Age, sex, activity, number of lay-ups, number of days from a race or official timed workout to fracture, number of days from end of last lay-up to fracture, mean duration of lay-ups, and total number of days in race training were compared between horses with humeral fractures and horses with pelvic fractures. A case-crossover study was used to estimate relative risk for fracture of the humerus or pelvis occurring within hazard periods of 10 and 21 days following lay-up, compared with periods following more regular participation in official racing or timed workout events. Horses with pelvic fractures were more often female, older, and had 0 or ≥ 2 lay-ups. Horses with humeral fractures were typically 3-year-old males that had 1 lay-up. Horses with pelvic fractures had more total days in race training, fewer days from last exercise event to fracture, and a greater number of days from end of last lay-up to fracture than horses with humeral fractures. Return from lay-up was strongly associated with risk for humeral fracture during hazard periods of 10 and 21 days (relative risk = 71 and 45, respectively). Risk of humeral fracture may be reduced if horses are cautiously reintroduced into race training after lay-up.

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