Magnetic resonance imaging of distal sesamoidean ligament injury.

The research explores the use of magnetic resonance imaging (MRI) in diagnosing injuries in the distal sesamoidean ligaments in horses, which is often a cause of lameness. The study also compares the effectiveness of MRI to ultrasonography, highlighting the inability of the latter to detect a significant percentage of such injuries.

Investigating the Normal Appearance of Distal Sesamoidean Ligaments

• The researchers first examined the normal appearance of the distal sesamoidean ligaments using MRI images from a control group of 66 horses.
• The ligaments in healthy horses had a distinguishing look and showed strong symmetry between the left and right sides.
• The study determined variation in size and signal intensity, with the lateral oblique sesamoidean ligament being larger and demonstrating a higher signal intensity as compared to the medial ligament.

Analysis of Injured Ligaments

• The changes that take place in the distal sesamoidean ligaments due to injuries were identified by analyzing MRI images of 58 horses diagnosed with distal sesamoidean desmitis.
• Increased cross-sectional area and signal intensity were significant characteristics denoting injured straight sesamoidean ligaments.
• The signal intensity observed was substantially high in the case of oblique sesamoidean desmitis compared to the control.

Findings and Conclusion

• In only 2 out of 58 horses, lesions of the distal sesamoidean ligaments were solely responsible for lameness.
• Surprisingly, ultrasonography, a traditional tool for diagnosing such injuries, failed to detect 80% of lesions in these ligaments, emphasizing the superiority of MRI in identifying these injuries.
• This underscores the need to shift toward more efficient modes of detection like MRI for correctly diagnosing and treating such conditions, thereby improving animal health and welfare.