Ex Vivo Assessment of an Ultrasound-Guided Injection Technique of the Navicular Bursa in the Horse.

The research paper discusses a tested ultrasound-guided technique for injecting into a horse’s swollen navicular bursa, with the aim to make it possible for the method to be utilized by clinicians without prior training. The success rate was found to be 68% for the twenty horse limbs used in the study.

Methodology

• The method followed in the study involved using distal limbs from horses of varying breeds and sizes.
• To imitate the swelling of the bursa, a contrast medium was injected into each limb’s navicular bursa using a lateral approach.
• Radiography was then used to confirm that the contrast medium was causing the bursa to distend.
• The condition of the distal interphalangeal joint was adjusted to hyperextension, and a microconvex ultrasound probe was placed to the rear of the second phalanx bone, in the dip of the pastern.
• The probe was turned to identify both the lateral and medial cavities for the most distended to be chosen for the injection.
• A needle was used to inject a solution of methylene blue into the proximal recess of the bursa that had the maximum distension.
• A dissection was performed after the injection to confirm whether the navicular bursa had been successfully injected.

Findings

• The ultrasound-guided technique was found to be successful in 68% of the cases.
• The effectiveness of the injection was found to be influenced by factors such as the hyperextension of the foot, the quality of ultrasound images, and the degree of distension of the bursa.
• The research is promising for broadening the use of this technique, potentially enabling it to be performed by clinicians without prior training in the technique.

Potential Impact of the Study

• Aside from presenting a new method for treating synovitis of the navicular bursa in horses, the study also encourages extension of ultrasound-guided injection techniques.
• If further training and research efforts are successful, the use of the method could be extended to a wider pool of clinicians. This could lead to more effective results and possibly an increased recovery rate in performance horses suffering from the condition.