Dr. Marta Mieszkowska and a team of researchers used thermography to measure distal limb temperatures on 16 Warmbloods that had been diagnosed with navicular bone changes or deep digital flexor tendon (DDFT) injuries. The horses were divided into two groups: the navicular horses were shod with egg-bar shoes and the DDFT horses were shod with wedge pads.

The egg-bar shoes shifted the horse's weight to the rear of the foot and increased the sole surface. The team noted that the shoes may compress blood vessels and adversely affect soft tissues.

The study showed that since w edge pads force the horse's coffin joint into a more-flexed position, they could increase pressure on an artery while reducing the load on the DDFT.

The research team determined that egg-bar shoes decreased the median temperature of the heel portion of the hoof. Wedge pads decreased the median minimal temperature in the heel and toe of the hoof.

The authors concluded that horseshoes may have a negative impact on blood circulation in the hoof, and noted that different types of shoes may result in different temperature differences.

Read more at EquiManagement.

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While human therapy often combines hot and cold therapy for an injury, it's not often done in equine veterinary medicine. Drs. Kevin Haussler, Shana Wilde, Michael Davis, Ann Hessa and Wayne McIlwraith wanted to determine if cycling between hot and cold therapies was possible, and if it might assist injured horses.

Called “contrast therapy,” the goal is to increase blood circulation using cold and hot therapies to force the injured area to cycle between vasodilation and vasoconstriction. For cold therapy to be of value, tissue temperature must be reduced to 50 to 59 degrees Fahrenheit. However, cold therapy generally doesn't penetrate beyond one inch of tissue, no matter how long it is applied. To be beneficial, heat therapy must get the tissue temperature above 104 degrees F, but stay below 122 degrees F to not cause damage.

For the study, the research team used four horses with no tendon issues. They placed temperature probes on the horse's skin and implanted them deeply in the subcutaneous tissue near the deep digital flexor tendons and near the superficial digital flexor tendons. This allowed the tendon tissue to be cooled to less than 45 degrees F and warmed to more than 118 degrees F. Each cycle lasted 15 minutes; each session applied three hot and three cold cycles for approximately two hours per session.

The scientists reported that the device was able to achieve consistent hot and cold temperatures in the superficial tissues, but could not reach the target temperatures in the subcutaneous tissue near the deep digital flexor tendons consistently. More studies will determine if longer treatment times or different hot and cold application ratios might allow the deep digital flexor tendon tissues to reach therapeutic temperatures.

Read the article here.

Read more at EquiManagement. 

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