MRI to Identify Bone Changes in Racehorses (AAEP 2012)

MRI could detect bone changes indicating a horse is at risk for catastrophic fractures before accidents occur.
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Horses can’t describe brewing musculoskeletal discomfort the way human athletes can, so trainers and veterinarians don’t know which horses to put on the proverbial bench to prevent career- or even life-ending injuries. But an equine research team has been using MRI to detect bone changes that could indicate a horse is at risk for catastrophic fetlock fractures before an accident occurs, allowing such career- or even life-saving intervention.

John G. Peloso, DVM, MS, Dipl. ACVS, owner, partner, and surgeon at the Equine Medical Center of Ocala, in Florida described the team’s research on fetlock and sesamoid fractures at the 2012 American Association of Equine Practitioners Convention, held Dec. 1-5 in Anaheim, Calif. Peloso relayed that the fetlock joint is the most common location of musculoskeletal disease leading to the euthanasia of Thoroughbred racehorses in the United States, United Kingdom, and Hong Kong. He cited several studies by Sue Stover, DVM, PhD, Dipl. ACVS, of the University of California, Davis, and colleagues that demonstrated catastrophic failure of the fetlock was responsible for more than 50% of cases submitted to the California Horse Racing Board (CHRB) postmortem examination program (which requires all horses that die within the racing enclosure at CHRB tracks to undergo a necropsy) over 15 years.

Additionally, he said, Stover et al. have found that pre-existing disease is present in almost every major bone that racing horses fracture.

Peloso said MRI is veterinarians’ preferred imaging modality for bone disease, and evidence suggests it could be used prerace to identify bone abnormalities of the fetlock before injuries occur. To investigate this, he and colleagues evaluated standing MRI as a potential prerace tool for fracture-risk assessment by comparing differences in bone disease between horses with fractures (cases) and horses without fracture (controls)

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Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.

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