Noncatastrophic and catastrophic fractures in racing Thoroughbreds at the Hong Kong Jockey Club.

Authors: Sun T C, Riggs C M, Cogger N, Wright J, Al-Alawneh J I

Journal: Equine veterinary journal

DOI: 10.1111/evj.12953 PubMed: 29672909Log in to save

Summary

# Editorial Summary: Racing Fractures in Hong Kong Thoroughbreds Whilst catastrophic fractures command attention in racing medicine, noncatastrophic injuries remain poorly characterised despite their prevalence and potential to compromise performance and predispose to career-ending damage. Sun and colleagues examined 64,807 racing starts over seven seasons at the Hong Kong Jockey Club, identifying 179 first fracture events and calculating incidence rates of 2.2 per 1000 starts for noncatastrophic injuries versus 0.6 per 1000 for catastrophic fractures—a 3.6:1 ratio highlighting the burden of nonlethal fracture disease. Proximal sesamoid bone fractures dominated catastrophic presentations (55% of cases), whereas carpal and first phalangeal fractures predominated amongst noncatastrophic injuries, with significant variation associated with sex, individual trainer management practices, and seasonal factors. The findings underscore that noncatastrophic fractures represent the major fracture challenge in racing populations and warrant systematic investigation, since these injuries disrupt training schedules, may compromise skeletal integrity, and could constitute stepping stones towards catastrophic failure. For practitioners, this work emphasises the importance of detailed post-injury evaluation and structured rehabilitation protocols, whilst highlighting that prevention strategies must address the trainer and seasonal variables influencing noncatastrophic fracture risk.

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Practical Takeaways

•Noncatastrophic fractures are nearly 4 times more common than catastrophic fractures in racing Thoroughbreds; monitoring and managing these injuries is critical to prevent progression to catastrophic outcomes
•Proximal sesamoid bones and carpal regions require particular attention in lameness evaluations and conditioning protocols for racing horses
•Training schedules must account for recovery from noncatastrophic fractures, as these injuries may predispose horses to future catastrophic fractures

Key Findings

•Noncatastrophic fractures occurred at an incidence of 2.2 per 1000 racing starts, compared to 0.6 per 1000 for catastrophic fractures, representing a 3.6:1 ratio
•Proximal sesamoid bone fractures accounted for 55% of all catastrophic fractures in racing Thoroughbreds
•The carpus and first phalanx were the most common sites for noncatastrophic fractures
•Significant associations existed between noncatastrophic fracture incidence and horse sex, trainer, and racing season

Conditions Studied

noncatastrophic fracturescatastrophic fracturesproximal sesamoid bone fracturescarpal fracturesfirst phalanx fractures

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