Your Guide to Equine Health Care

Managing Racehorse Joints with Strict Medication Regulations

In the face of new racing medication rules, vets are revisiting treatment approaches for injured horses.

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In the face of new racing medication rules, veterinarians are revisiting treatment approaches for injured animals on layup that trainers hope to send back to the track soon. At the American Association of Equine Practitioners’ Convention, held Dec. 7-11 in Nashville, Tenn., Wayne McIlwraith, BVSc, PhD, Dipl. ACVS, ACVSMR, described how these restrictions will impact management of traumatic arthritis and osteoarthritis, specifically.

Historically, administering intra-articular (directly into the joint) corticosteroids has been the treatment of choice to curb pain and swelling. McIlwraith, of the Colorado State University Equine Orthopaedic Research Center, in Ft. Collins, said that the Racing Medication and Testing Consortium (RMTC) has renewed interest in reviewing the timing of joint injections relative to racing. The current, newly drafted recommendation is to prohibit intra-articular corticosteroid injections within seven days preceding a race, along with imposing a 72-hour withdrawal time (meaning the horse cannot receive the medication within 72 hours of a race) on systemic administration of dexamethasone and other short-acting corticosteroids.

Rather than placing these new regulations into immediate effect, the consortium is providing a grace period over the next year to allow “time for veterinarians to adjust their practices and for trainers to adjust training strategies.” The objective of this new RMTC ruling is to facilitate complete compliance with the new regulations in an effort to protect the horses, jockeys, and drivers (in the case of harness racing). He pointed out that other countries–New Zealand and nations in Europe, for example–have previously examined these concerns and have implemented stricter drug restrictions with success.

With these new regulations in mind, McIlwraith described some alternative methods of managing joint disease in racehorses both by using smaller doses of corticosteroids or by not using them at all. One finding of note, he said, is that drug testing has shown that within seven days after administering up to 18 mg of the corticosteroid triamcinolone, levels fall below the required threshold. The same is true for treatment of up to 60 mg with the short-acting corticosteroid betamethasone—horses clear the drug within seven to 10 days. Methylprednisolone, a longer-acting corticosteroid, is also on the list of approved

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Written by:

Nancy S. Loving, DVM, owns Loving Equine Clinic in Boulder, Colorado, and has a special interest in managing the care of sport horses. Her book, All Horse Systems Go, is a comprehensive veterinary care and conditioning resource in full color that covers all facets of horse care. She has also authored the books Go the Distance as a resource for endurance horse owners, Conformation and Performance, and First Aid for Horse and Rider in addition to many veterinary articles for both horse owner and professional audiences.

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