Development, refinement, and validation of an equine musculoskeletal pain scale.

The research study is about developing and testing a scale that can accurately measure chronic musculoskeletal pain in horses, a condition often under-recognized and poorly treated.

Objectives of the Research

• The study aimed to create and validate a pain scale, known as the Musculoskeletal Pain Scale (MPS), for assessing chronic orthopedic pain in horses. This tool is intended to be easily used by both horse owners and veterinarians.
• Another goal of the study was to monitor and identify pain in horses more effectively, thereby advancing their treatment and improving their quality of life.

Methodology

• The researchers applied the new MPS to 154 horses, of which 83% were suffering from chronic orthopedic diseases.
• The horses were observed and filmed while at rest, following which they were given a complete clinical and orthopedic examination.
• The researchers also assessed the need for veterinary intervention as a means to determine the predictive power of the MPS, that was not influenced by this study.
• To establish interrater agreement (consistency of scores given by different raters), six additional raters, three equine veterinary practitioners, and three experienced horse-riders, scored the MPS for a subset of 30 horses chosen randomly.
• Based on the improvements in correlation with lameness evaluations, predictive validity for longitudinal health outcomes, and interrater agreement, the researchers used an iterative process to improve the MPS.

Results

• The refined MPS showed a substantial improvement in the intraclass correlation from the original 0.77 to 0.88, indicating better consistency of ratings by different raters.
• There was a significant correlation with lameness in horses at the walk and trot, further adding to its validity.
• There was a notable difference in the average MPS scores of horses that required veterinary intervention (mean MPS = 8.6) as opposed to those that did not (mean MPS = 5.0), indicating the scale’s ability to identify horses needing medical attention.

Conclusion

• The research concluded that the MPS achieves good repeatability across different raters.
• It also demonstrated a significant correlation with lameness and a good predictive capability for long-term health outcomes.
• Therefore, the study confirmed the MPS’s effectiveness in recognizing horses with orthopedic health issues, enabling timely intervention and treatment.