Dynamic evaluation of toe-heel and medio-lateral load distribution and hoof landing patterns in sound, unshod Standardbred horses with toed-in, toed-out and normal hoof conformation.
Authors: Mokry A, Van de Water E, Politiek H T, van Doorn D A, Pille F, Oosterlinck M
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary Although hoof conformation abnormalities—particularly toe-in and toe-out deviations—are commonly attributed to biomechanical dysfunction in horses, the relationship between these conformational variations and actual loading patterns remains poorly characterised, especially across different breeds. Mokry and colleagues evaluated 24 sound, unshod Standardbreds (nine with normal conformation, six toed-in, and nine toed-out) using pressure plate analysis during walk and trot, measuring peak vertical force, vertical impulse, and stance time while recording the medio-lateral and toe-heel load distribution and initial landing patterns. The study revealed notably that flat landing predominated (39.6% at walk, 70.8% at trot) irrespective of hoof conformation, and crucially, mild deviations in hoof alignment did not produce significant asymmetries in loading between forelimbs or substantially alter load distribution patterns—the only exception being marginally higher medial zone loading at the end of stance in toed-out horses during walk. These findings carry important implications for practice: whilst severe conformational defects warrant intervention, mild toe-in and toe-out variations in otherwise sound horses may not necessitate corrective farriery, and the predominance of flat landing in Standardbreds emphasises the critical need for breed-specific biomechanical reference data rather than applying Warmblood-derived expectations to all populations. This work should encourage a more nuanced, evidence-based approach to assessing hoof conformation rather than reflexively attributing clinical concerns to minor angular deviations.
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Practical Takeaways
- •Mild hoof conformational variations (toe-in/toe-out) in sound Standardbreds do not create clinically significant load asymmetries, so these alone are not indicators for intervention
- •Standardbreds naturally land flat more often than other breeds studied; breed-specific baseline data should guide clinical assessment rather than universal standards
- •Monitor toed-out horses for medial loading patterns during walk, though current data suggests this does not compromise soundness in unshod horses
Key Findings
- •No significant differences in peak vertical force, vertical impulse, or stance time asymmetry between normal, toed-in, and toed-out horses at walk or trot
- •Flat landing predominated in Standardbreds (39.6% at walk, 70.8% at trot), occurring more frequently than previously reported in Warmblood horses
- •Toed-out horses showed significantly higher medial zone loading at end of stance phase during walk compared to normal horses (P=0.002)
- •Mild deviations in hoof conformation did not significantly affect overall load distribution patterns in sound horses