Arthroscopic surgical approaches and intraarticular anatomy of the equine shoulder joint.

This research paper discusses the development of arthroscopic surgical techniques for the shoulder joint in horses. These techniques are evaluated for analyzing and potentially treating intraarticular lesions in equine shoulder joint. However, challenges such as difficulties in triangulation, fluid leakage and limited reach to potential lesions on the caudomedial humeral head were encountered, particularly in heavily muscled horses.

Arthroscopic Approaches Development

• The research team developed arthroscopic approaches to the scapulohumeral joint in four clinically normal, live horses (5 limbs).
• These surgical approaches were created to assess their effectiveness for diagnosing and potentially treating intraarticular lesions within the horses’ shoulder joint.

Intraarticular Anatomy Examination

• Several parts of the joint could be examined including the articular surface of the entire glenoid, cranial humeral head (medial and lateral), caudolateral humeral head, and the synovial membrane.
• An arthroscopic portal cranial to the infraspinatus tendon enabled close examination of these areas.
• The caudomedial humeral head could be partially examined through these techniques.

Instrument Portals Utility

• The cranial and caudal instrument portals offered good surgical access to the entire glenoid and most parts of the humeral head, except for the caudomedial in adult, heavily muscled horses.
• The research offered an effective approach to areas frequently affected by osteochondritis dissecans (OCD), a joint condition that can affect horses.

Potential Challenges

• Several potential difficulties were identified with the techniques, including problems establishing triangulation, and risks of fluid leakage during the procedure.
• Another significant drawback was the inability to reach potential lesions on the caudomedial humeral head using conventional equipment, specifically in larger, heavily muscled horses.