Diagnostic needle arthroscopy of the scapulohumeral joint in standing sedated horses.

This research reports on a method for performing diagnostic standing scapulohumeral joint needle arthroscopy with a 1.2-mm-diameter arthroscope in horses. The technique demonstrated its efficacy in examining parts of the joint, though it does have limitations due to the animal’s standing state.

Objective and Methods

• The study was divided into two phases, tested both on thoracic limbs and then on six sedated horses. The main objective of the research was to confirm the feasibility of performing needle arthroscopy of the scapulohumeral joint in standing horses.
• In the first phase, an experimental approach was used on eight thoracic limbs to evaluate the possibility of using the technique.
• During the evaluation, the researchers compared the capabilities of a needle arthroscope and a larger, 4-mm-diameter arthroscope. They inspected the visible structures of the scapulohumeral joint using both of these instruments.
• In the second phase, they validated the effectiveness of the technique on six live and sedated horses. They also took note of any complications or anything that limited the procedure’s success.

Results

• The evaluation of the joint was similar between the needle arthroscope and the 4-mm diameter arthroscope in phase 1.
• This examination allowed a comprehensive evaluation of approximately the lateral half of the humeral head and the lateral glenoid rim.
• In phase 2, all scapulohumeral joints were successfully accessed without any significant complications. Arthroscopic visualization was completely executed for the centrolateral aspect of the joint in all horses, while the craniolateral and caudolateral structures were either completely or partially visible.
• The method was quickly executed, well-tolerated, and didn’t lead to any post-operative complications.

Conclusions

• The research concludes that the technique described is straightforward and permits direct inspection of the scapulohumeral joint.
• However, due to the horse’s standing position during the procedure, the technique does not allow for the evaluation of the medial aspect of the humeral head and most of the glenoid cavity.
• Needle arthroscopy of the scapulohumeral joint is feasible in horses and provides a potential means for more precise diagnoses of certain shoulder pathologies in these animals.