| VETERINARY |
WOB B LE R SY N DR O ME AN D THE THOR OUGHB RED Professor Celia M Marr obbler syndrome, or spinal ataxia, affects around 2% of young Thoroughbreds. In Europe, the most common cause relates to narrowing of the cervical vertebral canal in combination with malformation of the cervical vertebrae. Narrowing in medical terminology is “stenosis,” and “myelopathy” implies pathology of the nervous tissue, hence the other name often used for this condition is cervical vertebral stenotic myelopathy (CVSM). Wobbler syndrome was the topic of this summer’s Gerald Leigh Memorial Lectures, an event held at Palace House, Newmarket. Gerald Leigh was a very successful owner/ breeder, and these annual lectures, now in their second year, honor Mr. Leigh’s passion for the Thoroughbred and its health and
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Professor Celia M Marr, Shutterstock
welfare. The lectures are attended by vets, breeders and trainers, and this year because of the importance and impact of wobbler syndrome on Thoroughbred health, several individuals involved in Thoroughbred insurance were also able to participate. Dr. Steve Reed, of Rood and Riddle Equine Hospital, Kentucky and international leader in the field of equine neurology gave an overview of wobbler syndrome. Affected horses are ataxic, which means that they have lost the unconscious mechanisms that control their limb position and movement. Young horses with CVSM will generally present for acute onset of ataxia or gait abnormalities, however, mild ataxia and clumsiness may often go unnoticed. Trainers often report affected horses are growing rapidly, well-fed, and large for their age. It is common for riders
to describe an ataxic horse as weak or clumsy. Sometimes, a horse that has been training normally will suddenly become profoundly affected, losing coordination and walking as though they were drunk, or in the most severe cases stumbling and falling. Neurological deficits are present in all four limbs, and are usually, but not always more noticeable in the hindlimbs than the forelimbs. In horses with significant degenerative joint disease, lateral compression of the spinal cord may lead to asymmetry of the clinical signs. When the horse is standing still, it may adopt an abnormal wide-based stance or have abnormal limb placement, and delayed positioning reflexes. At the walk, the CVSM horse’s forelimbs and hindlimbs may not be moving on the same track, and there can be exaggerated movement