A comparison of responses to analgesia of the navicular bursa and intra-articular analgesia of the distal interphalangeal joint in 59 horses.

The research is about comparing the responses of horses to two types of pain relief treatments – on the distal interphalangeal joint and on the navicular bursa – to determine which is most effective in alleviating horse lameness.

Metodology and Sample

• The researchers performed separate analgesia, or pain relief procedures on the distal interphalangeal (DIP) joint and the navicular bursa in the forelimb of 59 horses. These procedures were conducted on horses that were determined to be lame or exhibited signs of lameness. In these horses, a significant improvement in their condition was noted after pain relief treatment of either the palmar digital nerves or the palmar nerves.

Results

• Three of the horses did not respond to either analgesic procedure. In contrast, three horses showed improvement following pain relief treatment of the DIP joint, but no improvement was observed following analgesia of the navicular bursa.
• On the other hand, 12 horses exhibited improvement after the navicular bursa was treated, but there was no change following intra-articular analgesia.
• The majority of the sample – 41 horses – responded positively to both types of pain relief treatments.
• During the course of the research, synovial fluid was collected from all the DIP joints, but only from one navicular bursa.

Interpretations and Further Suggestions

• From the results, the researchers garnered that a positive response to the DIP joint analgesia doesn’t necessarily suggest that the joint is the cause of the pain, given that the horses also responded well to analgesia of the navicular bursa.
• Their suggestion is that a positive response to analgesia of the navicular bursa probably indicates issues with the bursa itself, or with the navicular bone, supporting ligaments or the DDFT.
• Moreover, they noticed radiographic abnormalities in the navicular bone of the lame limb in 35 horses – all of which responded to the analgesia of the navicular bursa. In the majority (71%) of these horses, the changes were only visible in the palmaroproximal-palmarodistal oblique views.
• It highlights the need for further research to understand better the causes of lameness in horses and implement more effective treatment strategies.