Comparison of basilar and axial sesamoidean approaches for digital flexor tendon sheath synoviocentesis and injection in horses.

The study is about finding a more effective method for the injection and synovial fluid retrieval from the digital flexor tendon sheath (DFTS) in horses. The basilar sesamoidean approach (BSA) was compared with the axial sesamoidean approach (ASA) and found the former to be superior in most aspects.

Study Methodology

• The research incorporated 12 healthy adult mares without any anomalies related to their lower limbs. They utilized the Latin square design to randomly assign one forelimb and one hind limb to each DFTS approach.
• The order of horses chosen and the limb to be injected for each horse was selected randomly. All procedures were conducted on horses that were standing and sedated.
• The study benchmarked the two methods based on the following criteria: the number of attempts required to place a needle in the DFTS, the presence of synovial fluid in the needle hub, the time taken for DFTS injection, and the number of successful injections of sterile contrast material into the DFTS, which was then evaluated by radiography.

Findings

• The average time for injection using the BSA was significantly shorter in comparison with the ASA.
• The median number of times that the needle was redirected was also substantially less for the BSA, making it a more efficient method.
• The probability of obtaining synovial fluid via the BSA was 5.7 times higher in comparison with the ASA.
• The success rate for the injection of contrast material into the DFTS did not exhibit a significant difference between the BSA (100% success rate) and ASA (96% success rate).

Conclusion

• The BSA was deduced as a more effective method for DFTS synoviocentesis in both the forelimbs and hind limbs of standing sedated horses. This was mainly because it recorded faster injection times, required fewer needle redirection, and had a higher probability of harvesting synovial fluid.
• Despite both the BSA and ASA showing high success rates in injecting contrast material into the DFTS, the BSA exhibited superiority in most aspects.
• Considering these findings, the research recommends that the BSA should be the preferred approach for DFTS injection or synovial fluid retrieval, particularly in horses with minimal DFTS effusion.