Tenoscopic release of the equine carpal canal.

The researchers developed a less invasive method for treating Carpal Canal Syndrome in horses. They used a technique called tenoscopy to perform endoscopic division of the carpal flexor retinaculum in the horse’s leg, showing successful decompression without causing additional damage.

Study Background

• The research revolves around the development of a tenoscopic method aimed at dividing the carpal flexor retinaculum, which is a sheath in a horse’s limb, and thereby decompress the carpal canal. This study originates from the need for a minimally invasive method to treat Carpal Canal Syndrome in horses, similar to Carpal Tunnel Syndrome in humans.

Study Methods

• Initially, the researchers tested this method on twelve cadaveric limbs to observe and evaluate the success, safety, and efficacy of the technique.
• Next, they tested the method on four clinically normal horses and two horses already affected by the syndrome. The researchers conducted a tenoscopic approach on the proximolateral aspect of the carpal sheath in these horses, carefully identifying and facilitating the endoscopic division of both the inner and outer layers of the carpal flexor retinaculum.

Study Results

• The trial results, based on anatomic dissection, intraoperative observation, necropsy, histologic evaluation, and short- and long-term clinical follow-up, indicate that a tenoscopic approach is successful in decompressing the equine carpal canal.
• Importantly, there was no iatrogenic damage inflicted on the surrounding structures of the horse’s limbs, ensuring the safety of the method.
• It was further noticed that the division of the retinaculum, resulting from the procedure, was not only adequate but also permanent, and clinical morbidity was insignificant.
• Evidence of resolution of effusion (accumulated fluid in cavities or tissues) in both clinical cases of carpal canal syndrome was recorded. The procedure also resolved lameness (difficulty in moving) in one horse, corroborated by the long-term follow-up.

Conclusions

• The study concluded that the tenoscopic release of the carpal flexor retinaculum has the potential to provide a minimally invasive method that is quick, safe, and efficient for decompressing the carpal canal.
• Its application hence serves as a safer alternative to the open division of the retinaculum for decompressing the carpal canal in horses affected with carpal canal syndrome, reducing the risk and recovery time for the patients.