Atlanto-axial malformation in an adult Quarter horse gelding.

This research observes an unusual bone deformity in the neck of an adult gelding horse that had been experiencing unexplained limb lameness for two years. The discovered malformation in the horse’s atlanto-axial region, which is likely to be congenital, could explain the observed neurological symptoms.

Overview of the Research

• This research paper revolves around a case study involving an adult male horse (gelding), which was examined for an intermittent lameness in its two forelimbs that had been persisting for about two years.
• The gelding displayed 2/5 grade upper motor neuron-general proprioception ataxia, a neurological condition evidenced by abnormal movement coordination. However, there were no cranial nerve deficits observed, indicating the troubling symptoms exhibited by the horse were not a result of cranial nerve disease.

Radiographic and Necropsy Examinations

• To further investigate the cause behind these neurological symptoms, a series of radiographic examinations were conducted. Radiographic examinations involve using X-rays or other high-energy radiation to view the internal structure of non-transparent materials, in this case, the horse’s body.
• A novel atlanto-axial malformation was identified in these examinations. The atlanto-axial region refers to the juncture of the first and second vertebrae in the neck, which plays a significant role in enabling head movements.
• Upon the horse’s death, a gross necropsy examination was performed, providing a detailed post-mortem examination of the horse’s body. The necropsy further validated the discovery of the atlanto-axial malformation.

Possible Congenital Etiology

• The research puts forth the possibility that this malformation could be of a congenital origin. This implies that the malformation likely existed from the horse’s birth, rather than occurring due to injury or other environmental factors later in life, and could be the reason behind his neurological symptoms.

Significance of the Findings

• Determining the presence of such anatomical malformation in large animals could prove vital in diagnosing similar neurological symptoms. This case study provides valuable insight for further research and discovery in equine veterinary medicine.