Limb Positioning for Assessing Joints via X Ray (AAEP 2012)

How a horse is positioned while X rays are taken significantly affects joint balance, researchers say.
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Lower limb radiographs can help practitioners uncover valuable information about bones, joints, and joint balance in equine athletes, but Colorado State University (CSU) researchers have determined the usefulness and accuracy of this information depends largely on how the horse stands during X ray capture.

“Imbalances in certain joints such as the interphalangeal joints, also called the pastern and coffin joints, can influence gait, biomechanics, and soundness in horses,” said Erin Contino, DVM, MS, of CSU’s College of Veterinary Medicine, in her presentation at the 2012 American Association of Equine Practitioners Convention, held Dec. 1-5 in Anaheim, Calif.

Imbalances can occur for several reasons, such as the horse’s natural conformation, the type of shoe he is wearing, or how he is shod. Imbalances in the foot where one heel bulb is “higher” than the other, for example, can impact the balance of the joints higher up in the limb, change how the horse bears weight, and even how he moves. In fact, notes Contino, foot imbalances can influence gaits, biomechanics, and soundness.

Further, Contino and colleagues suspected that how the horse’s foot is positioned while taking radiographs can influence joint balance, making accurate X ray interpretation difficult if the foot is not positioned appropriately

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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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