Desmitis of the straight sesamoidean ligament in horses: 9 cases (1995-1997).

This study investigates the symptoms, diagnostic methods and outcomes of horses suffering from desmitis of the straight sesamoidean ligament, with the research suggesting this condition should be considered as a potential cause of lameness in performance horses that show no radiographic abnormalities.

Objective and Methodology

In their quest to better understand desmitis of the straight sesamoidean ligament (SSL) in horses, the researchers embarked on a retrospective study examining nine relevant cases from 1995 to 1997. The medical records of these horses were meticulously reviewed, gathering information on the horses’ individual characteristics, historical data, clinical signs, diagnostic findings, and treatments administered. Further follow-up information was obtained by engaging in telephone conversations with the horse owners.

Findings

• All the diagnoses in these cases were realized via the use of high-resolution ultrasonography, underlining its importance in identifying this condition.
• Initial examinations showed that seven horses had moderate lameness, a condition which got worse in six of the horses when flexion of the distal limb joints was induced. This lameness, however, could not be explained using clinical signs alone, necessitating diagnostic local anesthesia to accurately pinpoint the lameness source to the distal limb region.
• The condition manifested in five horses on their forelimbs (one horse had it on both limbs), and on the hind limbs of four horses (again, one horse was affected on both limbs).

Treatment and Outcome

The primary course of action taken against SSL desmitis in these cases was a six-month rest and <a href="/equine-rehabilitation-guide/" title="Equine Rehabilitation Programs: What to Expect When Your Horse is Recovering – [Guide]”>rehabilitation program. This approach proved beneficial, as six out of the nine horses made a successful return to their intended use, providing evidence that horses facing an acute injury of this kind have a reasonable chance of responding positively to treatment and resuming their initial roles.

Conclusion

The study’s results highlight that desmitis of SSL, specifically proximal to its insertion on the middle phalanx, should be regarded as a potential lameness cause in horses, particularly performance ones, with lameness localized to either their forelimb or hind limb but no sign of radiographic abnormalities. The application of high-resolution ultrasonography was crucial in making the diagnoses in these cases.