Catastrophic Musculoskeletal Injuries in Thoroughbred Racehorses in Uruguay, 2011-2017.
Authors: Bimson Nicholas H, Morrice-West Ashleigh V, Wong Adelene S M, Hitchens Peta L, Rocca Maria R, Whitton R Chris
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Catastrophic Musculoskeletal Injuries in Uruguayan Thoroughbreds Between 2011 and 2017, researchers documented 77 catastrophic musculoskeletal injuries (CMI) among Uruguayan racing Thoroughbreds to establish incidence rates and identify risk factors in a South American population previously underrepresented in the literature. Using a retrospective cohort design with case-control matching for race-day injuries, the team calculated CMI incidence at 0.42 per 1,000 race starts for racing and 0.059 per 100 horse months for training—a notably low rate considering Uruguay's racing infrastructure and documented risk factors. The majority of injuries affected the forelimbs (80.3%), split roughly equally between distal fractures (41.6%) and proximal injuries (50.6%); alarmingly, nearly 30% of affected horses had never raced before sustaining their injury. Horses with limited race history and extended periods away from competition faced significantly elevated CMI risk, suggesting that inadequate conditioning or readiness protocols may compound inherent weakness in insufficiently raced individuals. These findings underscore the importance of careful fitness assessment, graduated return-to-racing programmes, and heightened vigilance around horses with sparse racing experience—particularly those competing after substantial time off, where trainers and veterinarians should ensure appropriate preparation and potentially modified early-season expectations.
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Practical Takeaways
- •Lightly raced horses returning after extended rest periods require close monitoring before and during racing, as they show elevated catastrophic injury risk
- •The majority of catastrophic injuries occur in forelimbs; pre-race screening should prioritize forelimb assessment in at-risk populations
- •Racing operations should track race history and race-to-race intervals as simple risk stratification tools to identify horses requiring additional clinical evaluation
Key Findings
- •Race day CMI incidence was 0.42 per 1,000 race starts (95% CI 0.29, 0.60) in Uruguayan Thoroughbreds
- •Training CMI incidence was 0.059 per 100 horse months
- •80.3% of CMIs involved forelimbs, with 41.6% distal and 50.6% proximal fractures
- •Horses with fewer prior races and longer intervals since previous racing had significantly greater CMI risk