Ultrasonographic Evaluation of the Suspensory Ligament in Quarter Horses Used for Cutting.

The study conducted an ultrasonographic evaluation of the suspensory ligament in Quarter Horses involved in cutting exercises. The goal of the study was primarily to create a standard measurement for the cross-sectional area of the proximal suspensory ligament, monitor the changes in suspensory ligament during training and evaluate the effect of suspensory ligament disease on the lifetime earnings of the horses.

Research Methodology

• The study included 110 two-year-old cutting horses and subjected them to ultrasound examination of the suspensory ligament in all limbs.
• This process was repeated two years later on 51 of the remaining horses.
• They collected data based on a comparison of the cross-sectional area at certain points between the two time periods.
• An equine radiologist subjectively graded the entirety of examination data.
• From the National Cutting Horse Association, the lifetime earnings ($LTE) of each horse were obtained and analyzed based on the number of abnormalities, location, and how they developed over time.

Findings and Results

• A total of 267 suspensory ligament ultrasound examinations at both points in time were measured and graded. This data helped in establishing a standard measurement for the cross-sectional area for forelimbs and hindlimbs in such horses.
• The study showed an increase in the prevalence of abnormal limbs between the second and fourth years of the horses’ lives.
• Forelimb abnormalities were statistically more prevalent than hindlimb abnormalities at both time points.
• Additionally, osseous attachments abnormalities were statistically more common than ligament abnormalities at these time points as well.
• No significant differences were detected in the change of the ligament’s cross-sectional area over time in any group.
• Moreover, there were no significant differences in the lifetime earnings among or between the groups.

Conclusion

The research provides valuable insights into the typical morphology of the suspensory ligament in Quarter Horses employed in cutting exercises. It brings to light the nuances of the abnormalities that may arise and their prevalence rate. Importantly, it indicates that suspensory ligament abnormalities don’t have significant impact on horses’ earning potential. This information can be instrumental in early diagnosis and treatment, understanding changes due to work-related stress and improving the health and performance of horses in this discipline.