ultrasound could save racehorses from bucked shins
Top: Cross-sectional view of the bone mineral density distribution in the metacarpal bone measured by computed tomography. Bottom: Simulated wave propagation in bone. Credit: Miyashita et al.

When racehorses enter training at about 2 years old, they can develop tiny stress fractures and new bone formations in their legs. This condition, called bucked shin, occurs in about 70% of the animals, leading to pain and delays in training schedules.

In The Journal of the Acoustical Society of America, researchers from Doshisha University, Nagasaki University, and the Japan Racing Association Equine Research Institute developed a method to screen for bucked shin using ultrasound.

Although X-ray radiography can diagnose bucked shin, computed tomography scans and MRIs are necessary to evaluate the severity in detail. These strategies are difficult to use on large animals, especially in the field. Horses require anesthesia and must be lying down.

Axial transmission, in which an ultrasound emitter and receiver are placed on the skin to induce and measure wave velocities, is frequently used to study osteoporosis in humans. The method could detect bucked shin more easily and preserve the health and growth of young horses.

“If we can identify this disease at early stages, we can stop training for a period of several weeks or have the horses do light training while they recover,” said author Mami Matsukawa, from Doshisha University in Kyoto, Japan.

To achieve this task, Matsukawa and her team created multiple 3D digital models of a racehorse metacarpal bone with varying degrees of bucked shin. Each was based on computed tomography measurements of a real bone with bucked shin.

The researchers simulated ultrasonic wave propagation along the bone model, finding two main wave components with different velocities, one faster and one slower. In the area with bucked shin, the fast waves changed speed dramatically because of irregularities in the bone, while the slow waves were almost unaffected.

“We use these velocities of the waves to judge if there is a bucked shin or not,” said Matsukawa. “In an area with bucked shin, there is a new bone formation. If you touch your leg, most likely it is very smooth and there are no irregularities. But if there was some new bone formation, you would find some irregularities in the shape that change the fast wave speed.”

The simulations showed that the larger the area of bucked shin, the more variation in the fast waves. Because the axial transmission technique is already established for humans, translating it to work for horses should not be too difficult a task. In comparison to other methods, such ultrasound devices would be small, compact, easy to carry, and inexpensive.

While this study used only the velocity as a diagnostic, the team aims to use other wave characteristics, like the modes and attenuation, to obtain material properties of bone in the future.

The article is titled “Study on ultrasonic wave propagation in equine leg bone for screening bucked shin.” More information: Study on ultrasonic wave propagation in equine leg bone for screening bucked shin, The Journal of the Acoustical Society of America (2022). DOI: 10.1121/10.0012689 Journal information: Journal of the Acoustical Society of America

Provided by American Institute of Physics Citation: Ultrasound could save racehorses from bucked shins (2022, August 9) retrieved 9 August 2022 from https://phys.org/news/2022-08-ultrasound-racehorses-bucked-shins.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

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