Relationship Between Historical Lameness, Medication Usage, Surgery, and Exercise With Catastrophic Musculoskeletal Injury in Racehorses.
Authors: Hitchens Peta L, Hill Ashley E, Stover Susan M
Journal: Frontiers in veterinary science
Summary
# Editorial Summary Catastrophic musculoskeletal injuries (CMI) in racehorses occur at higher rates in the United States than internationally, yet few modifiable risk factors have been systematically identified to guide preventive management. This case-control study compared veterinary medical histories of 45 Thoroughbreds and 11 Quarter Horses that died from CMI against matched controls (101 and 6 respectively), using data from California necropsy records and attending veterinarian surveys to investigate associations between CMI and preceding lameness, medication use, surgical history, and training intensity. Thoroughbred case horses were significantly more likely to have shown clinical lameness in the three months before death; notably, unraced affected horses had received more systemic medications than those with racing history, and cases had trained at higher intensity throughout their careers but reduced exercise in the month preceding injury—a pattern suggesting either fatigue accumulation or inadequate adaptation time. Surgery history showed no association with CMI risk in either breed, though the Quarter Horse cohort lacked statistical power to draw firm conclusions. These findings suggest that monitoring for recent-onset lameness, scrutinising medication protocols in young or unraced horses, and carefully managing training load reductions (rather than simply easing off intensive work) may help identify at-risk individuals and modify preventable factors before catastrophic failure occurs.
Read the full abstract on PubMed
Practical Takeaways
- •Recent lameness in the 3 months before a catastrophic event is a red flag—investigate thoroughly before returning horses to racing intensity
- •High medication usage is common in both injured and uninjured racehorses; focus on identifying horses showing lameness signs rather than medication use alone as a risk factor
- •A sudden decrease in racing intensity after a period of high intensity may indicate underlying musculoskeletal compromise—do not assume improvement means safety to resume normal work
Key Findings
- •Thoroughbred cases showed significantly more lameness signs in the 3 months prior to catastrophic injury compared to controls
- •64.3% of CMI cases and 76.8% of controls received medications, with unraced TB cases receiving more systemic medications
- •TB cases raced with greater intensity during their career but reduced intensity in the month preceding catastrophic injury
- •Surgery history was not associated with increased risk of catastrophic musculoskeletal injury