Measurement accuracy of foot conformation parameters on low-field magnetic resonance images in horses.

This research investigates the accuracy of foot conformation measurements made using low-field magnetic resonance (MR) images, as compared to radiographic images, in horses. Results revealed a discrepancy between measurements made from both image sources, with implications for precision in corrective trimming and shoeing.

Research Aim and Methodology

• The goal of the research was to determine the accuracy of foot conformation parameters measured using standing low-field MR images in comparison to radiographic images. The study assumes relevance because of the prevalence of foot imbalance and malalignment in horses, which require corrective procedures guided by these measurements.
• The researchers performed angle and distance measurements on bones, joints, and the hoof wall using these imaging sources. The study involved images of 100 horses referred for a standing low-field MR examination.
• Measurements made from both imaging sources were compared, focusing on dorsopalmar and lateromedial foot conformation parameters.

Findings

• The research found that measurements from the vast majority of the imaging sources had significant differences. This means that there are substantial divergences between measurements made using low-field MR images and radiographs.
• Despite these differences, there was a moderate to high correlation of foot conformation angles between radiographs and MR images in both the lateromedial and dorsopalmar planes. This indicates that the measured values, though different, tend to increase and decrease in tandem.
• However, this correspondence was not observed in the proximal interphalangeal joint angle. Only moderate agreement was found between radiographs and the 5-plane MR pilot as well as between radiographs and the 3-plane MR pilot.

Implications

• The results indicate that low-field MR image-based measurements should be used with caution in clinical practice because they may differ from those based on radiographs.
• The researchers recommend the acquisition of current foot radiographs immediately before or after a MR examination to facilitate precise trimming and shoeing. Such an approach can ensure accuracy in the corrective procedures for foot imbalance and malalignment in horses.