Modified tenoscopic method for carpal flexor retinaculum release in a horse.

The research article describes a new surgical technique for treating carpal canal syndrome in horses using a modified endoscopic method. The procedure, called carpal retinaculum release, proved successful in the reported case, as the treated horse was able to return to racing 14 months post-surgery.

Methodology

• The case study involves a 4-year-old Thoroughbred female horse diagnosed with carpal canal syndrome. This condition was secondary to traumatic suppurative tenosynovitis, an inflammation of the tendon sheath often associated with infection.
• The surgical method used for the treatment involved debridement of the accessory carpal bone (process of removing damaged tissue or foreign objects from a wound) and release of the carpal retinaculum, which is a band of fibrous tissue located in the horse’s carpal tunnel.
• The operation was performed using a tenoscope, a type of endoscope designed for tendon surgery. This required two access points (portals): a proximolateral endoscope portal and a distolateral instrument portal.

Results

• The procedure resulted in the resolution of the carpal sheath effusion (accumulation of excess serous fluid) and the horse’s lameness, eventually allowing the animal to return to racing after 14 months.
• Use of the distolateral instrument portal, a key component of the surgical method, did not lead to any complications or any iatrogenic (caused by medical examination or treatment) damage to neurovascular structures.
• The distolateral portal also reduced interference between the endoscope and surgical instruments, and offered easier access to the distal part of the carpal sheath, the protective layer of the tendon that passes through the horse’s carpus (equivalent to the human wrist).

Conclusions

• The researchers concluded that the carpal retinaculum can be safely released using a distolateral instrument portal when it’s necessary to access the lower part of the carpal sheath.
• The use of the distolateral portal, as described in the study, may also be a useful alternative to a proximolateral portal when access to the distal carpal sheath is necessary or advantageous from a surgical point of view.