Dr. Melissa Story studied 14 horses that had exhibited increasingly dangerous behavior, putting their riders' safety at risk, and had subsequently been euthanized.

She and her research team performed spinal exams, gait evaluations, diagnostic imaging, neurologic evaluations, and pathologic and histopathologic exams of the axial skeleton (the skull, the rib cage, and the backbone).

Those evaluations, along with prior medical records, owner and trainer complaints, and an exam completed once the horses had been euthanized, allowed the scientists to tentatively determine that skeletal pain may have been to blame for the horses' behavior.

Ten horses showed severe behavioral responses during both the mobilization and myofascial exams. The most common areas of concern were the lumbosacral and cervicothoracic regions. Additionally, 71 percent of study horses had hemorrhage or hematomas in these areas.

The scientists concluded that structural pain (neuropathic) was the root cause of the dangerous behavior. They noted that ganglia relay peripheral sensory information to the central nervous system and that ganglionitis has been associated with neuropathic pain syndromes. More research is needed.

Read more at Veterinary 33. 

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