Evaluation of clinical and tenoscopic findings in the carpal flexor sheath of horses.

The researchers investigated the pre-surgical clinical signs in horses undergoing surgery on their carpal flexor sheath (CFS) to assess any associations with tenoscopic findings. A total of 242 subjects were examined, and the study found that effusion in the CFS was predictive of tears in the deep digital flexor tendon (DDFT), but not predictive of the severity of those lesions.

Objective and Animals Involved

• The primary goal of the study was to evaluate clinical and tenoscopic findings among a large group of horses undergoing surgical procedures on their carpal flexor sheath (CFS), with a particular focus on identifying potential associations between pre-surgical clinical indicators and subsequent tenoscopic findings.
• The sample group incorporated the medical profiles and tenoscopic video records of 242 horses that had previously undergone both diagnostic and therapeutic tenoscopy of the CFS due to aseptic tenosynovitis. These cases were all processed at one single equine clinic between January 2005 and June 2014.

Procedures and Results

• Each tenoscopic finding was classified as either ‘present’ or ‘absent’, while tears in the deep digital flexor tendon (DDFT) were subjectively graded based on severity.
• A logistic regression analysis was conducted to determine if presurgical clinical findings had any association with intraoperative tenoscopic findings.
• Out of all horses, 242 (411 limbs in total) were evaluated using tenoscopy. An exostosis, a bony outgrowth, was detected in most horses (228 out of the 242 examined, affecting 379 limbs), often in multiple parts. These were usually located medial to, or within, the sagittal plane at the caudal (tail) margin of the scar on the distal physis (end growth area) of the radius (forelimb bone).
• Effusion, or fluid build-up in the CFS, was associated with tears in the DDFT. Other pre-surgical clinical findings did not show strong predictability for intrathecal (within the sheath) findings.

Conclusions and Clinical Relevance

• The study concluded that synovial effusion was a good predictor for the presence of lesions in the DDFT of the CFS. However, it was not found to be an accurate predictor of the severity of those injuries.
• This suggests that while effusion can help identify potential issues, its presence does not necessarily signify the extent of tendon damage.
• The researchers identified the need for additional studies to confirm whether any specific tenoscopic findings have a direct linkage with reduced athletic performance in horses and to evaluate the impact of surgical intervention on the health and performance of affected horses.