A novel method to estimate the stiffness of the equine back.

This research article discusses a new approach for estimating the stiffness of a horse’s back, which can aid in diagnosing back issues in horses. Using a combination of electromyography and video recording, the researchers developed a transfer function that correlates the activity of a horse’s back muscles with its motion, providing a reliable measure of back stiffness.

Methodology

• The research team developed a system involving telemetric surface electromyography and a video camera recording system, focused on measuring the activity in a horse’s long back muscle.
• Measurements were taken at two points on either side of the horse’s back (thoracic vertebrae T12 and T16) as the horse flexed and extended in position.
• The research team then used the paired data from these measurements to compute a transfer function in the frequency domain, aiming to accurately capture the biomechanical behavior.

Analysis and Evaluation

• The efficacy of the transfer function was evaluated by correlating the calculated and actual movements of the horse’s back. Reliability was good, with correlation coefficients of 0.89 for lateral flexion and 0.83 for ventral extension at T16; and 0.82 for lateral flexion and 0.83 for ventral extension at T12.
• The transfer function was then fitted into a second-order filter polynomial and connected with the movement equation.
• The researchers then compared coefficients, allowing them to estimate the stiffness of the horse’s back. The average result was approximately 6100 N/m for lateral flexion and 650 N/m for ventral extension.

Conclusions

• This new method provides a reliable and efficient way for clinicians in equine orthopedics to gauge the stiffness of a horse’s back, aiding the diagnosis and treatment of back issues in horses.
• The felt values provided in this study are rooted in reality, making them a beneficial tool for developing biomechanical models of the equine back.