Hoof growth between two shoeing sessions leads to a substantial increase of the moment about the distal, but not the proximal, interphalangeal joint.

Research Overview

This research investigates the effects of hoof growth between shoeing sessions on the internal structures of a horse’s distal limb and how horses compensate for these changes in hoof conformation. Specifically, the study measures the changes in moments around the proximal and distal interphalangeal joints (PIPJ, DIPJ).

Research Methodology

• The study involved nine sound Warmblood horses. These horses had their front feet measured while standing on a pressure-force measuring system just after shoeing and then again after eight weeks.
• The researchers also radiographed the horses’ feet from a lateromedial direction at these same intervals.
• The data collected included ground reaction forces (GRF) and lever arms.
• These measures were used to calculate joint moments, which indicate the rotational force acting on the joint.

Key Findings

• The research found that after eight weeks, there was no significant increase in the moment about the PIPJ. However, there was a substantial increase in the moment about the DIPJ.
• This increase in the DIPJ suggests that horses have a compensatory mechanism for changes in hoof conformation. Specifically, they increase DIPJ extension, which leads to an increased loading of the deep digital flexor tendon.

Significance of the Study

• This study provides quantitative insight into the effects of a shoeing interval on the internal structures of a horse’s foot.
• The findings can potentially help determine the most suitable shoeing interval for individual horses. The study suggests that the hoof with the lowest angle is the best indicator for making this decision.
• The research highlights that further studies are needed to precisely determine the optimal individual shoeing interval.