An alternative arthroscopic approach to the caudal pouches of the equine lateral femorotibial joint.

This research paper provides a description of an alternative arthroscopic approach to treating the caudal pouches of the lateral femorotibial joint in horses. This new method, developed from both anatomical studies and practical surgeries, offers a consistent and safe option for treating equine joints and potentially discovering previously unrecognized conditions.

Research Objectives and Methodology

• The objective of this study was to develop and describe an alternative, safer arthroscopic approach to the caudal pouches of the lateral femorotibial joint in horses. The current treatment methods posed challenges and risks, including potential nerve and cartilage damage.
• The researchers developed a new approach during clinical surgery that permitted a consistent entry into these pouches via an arthroscopic portal in the femorotibial joint’s popliteal tunnel.
• The anatomy of the lateral femorotibial joint was reviewed using 19 cadaver limbs for validation of the arthroscopic landmarks. The verified procedure was then incorporated into an inspection of 38 joints in 33 horses.

Findings and Results

• The study’s results showed that using an arthroscopic portal located immediately cranial to the lateral collateral ligament achieved consistent entry and examination of both caudal pouches. This was confirmed on both cadaver and clinically treated limbs, with no adverse effects observed in the latter.
• The division of the pouches, contrary to previous descriptions, was found to be principally formed by a meniscopopliteal septum sourced from the joint capsule in all cases, rather than the popliteus muscle and tendon.
• The researchers identified abnormal conditions in five instances. The finding of bilateral tearing within the popliteus muscle could represent a previously unrecognized arthroscopic condition.

Conclusions

• Despite the study’s limited sample size, the findings suggest that the new approach using an arthroscopic portal immediately cranial to the lateral collateral ligament allowed for consistent access to the popliteal tunnel and both pouches of the caudal lateral femorotibial joint.
• The research presents an alternative method that may increase the safety and consistency of horse joint arthroscopic treatments, potentially identifying new conditions in the process.