A diagnostic pathologist’s guide to carpal disease in racehorses.

The research article discusses the difficulties in diagnosing carpal disease in racehorses, due to their complex anatomy and severe impact of small or subtle lesions. The article provides a comprehensive guide to performing postmortem evaluations, as well as a review of common carpal injuries and diseases found in racehorses.

Understanding Carpal Disease in Racehorses

The main focus of this research is on understanding the complexities involved in diagnosing carpal diseases in racehorses. Factors contributing to this difficulty include:

• The complex anatomy of the horse’s carpus, or knee, which is a common site of injury and can often be the source of lameness in performance horses.
• The impact of small or subtle lesions (abnormal tissue or damage) that can result in significant lameness and even catastrophic secondary injuries such as musculoskeletal fractures.

Research Aim

The authors aimed to:

• Provide a concise summary of the clinically relevant anatomy and function to serve as a guide for postmortem evaluation of the equine carpus.
• Review common carpal injuries and diseases found in actively training, racing, or retired racehorses. These include developmental lesions (incomplete ossification, osteochondromata), infectious and inflammatory lesions (septic arthritis and tenosynovitis), and degenerative and traumatic lesions (degenerative and traumatic osteoarthritis, osteochondral fragmentation, and polyostotic catastrophic “breakdown” fractures).

Methodology

To illustrate these points, the authors:

• Presented representative gross and histologic images along with corresponding antemortem and postmortem diagnostic images.
• Reviewed the current scientific literature pertaining to the pathogenesis (the biological mechanism that leads to the diseased state) of these carpal lesions in equines.

This research is a significant contribution to the field of equine pathology, providing both a practical guide to postmortem examination of the equine carpus and a comprehensive review of existing scientific literature on the topic.