In vivo and in vitro heel expansion in relation to shoeing and frog pressure.

This study investigates a method for measuring the expansion of a horse’s heels, and how this expansion changes under different conditions, such as varying pressures from the horse’s hoof and different shoeing techniques. The researchers also tried to correlate the observed changes in heel expansion to the health of the hoof.

Study Aim and Methodology

• The study had two main goals: to validate a simple, accurate method for measuring the medial-lateral expansion of a horse’s heels and to investigate how this expansion varies in different areas of the heel and under varied conditions using both in vivo and in vitro models.
• The in vitro part of the study involved the use of five right and five left distal forelimb specimens from Standardbred horses. These specimens were tested in a variety of states: unshod, with pressure on the frog (the v-shaped part in the center under a horse’s hoof), and with the weightbearing rim raised.
• On the other hand, the in vivo part of the study was carried out with live Standardbred horses. Measurements were taken from the left forelimb at three different states: unshod, shoeing with standard iron shoes, and shoeing combined with inflatable hoof-cushions. Data was collected while the horses were at rest, and also during a walk and trot.

Research Findings

• The findings from the study demonstrated a strong correlation between the two measurement systems. This suggests the methods used in the study are reliable and accurate for further use and investigation.
• The researchers found that increasing pressure on the frog and soul of the horse’s hoof resulted in greater heel expansion. Interestingly, some heel expansion still occurred even when the frog and soul were not supported, supporting both the pressure and depression theories.
• The study’s result also provided insights into how heel movement can be manipulated using different farrier (horse shoeing) techniques, which in turn affect the health of the hoof.

Implications and Future Research

• The study opens up avenues for further research into understanding the biomechanics of a horse’s hoof, particularly the relationship between heel movement and the health of the hoof.
• This knowledge could be used to improve farrier techniques and horse shoe design, potentially leading to better hoof health and, by extension, overall well-being and performance of the horse.
• Future studies are necessary to properly apply the knowledge gained from this research to the practices of farriery.