Fact Sheet: OCD in Horses

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Of all the conditions that can potentially affect the joints of foals and young horses, osteochondritis dissecans (OCD) provides an abundance of murky waters through which to navigate. Do all young horses with fluid-filled joints or lameness have OCD? Or is it simply osteochondrosis (OC)?

Alas, in real life, the terms OCD and OC often become intermeshed and used interchangeably, ergo incorrectly. One recently published review article helped clarify by explaining, “OC represents the initial disease process, whereas OCD reflects secondary changes resulting in cartilage flap or osteochondral fragment formation.”1 In other words, osteochondrosis occurs after cartilage fails to properly turn into bone. Those OC lesions either (1) resolve on their own in young animals, or (2) the condition worsens to the point that fragments of cartilage can form, becoming OCD lesions.

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Written by:

Stacey Oke, MSc, DVM, is a practicing veterinarian and freelance medical writer and editor. She is interested in both large and small animals, as well as complementary and alternative medicine. Since 2005, she’s worked as a research consultant for nutritional supplement companies, assisted physicians and veterinarians in publishing research articles and textbooks, and written for a number of educational magazines and websites.

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