Time domain characteristics of hoof-ground interaction at the onset of stance phase.
Authors: Burn J F
Journal: Equine veterinary journal
Summary
# Editorial Summary: Hoof-Ground Collision Dynamics at Stance Onset Whilst high-impact collisions during initial ground contact are frequently implicated in lameness aetiologies, fundamental knowledge of how the hoof actually interacts with the ground at this critical phase remains limited. Burn used biaxial accelerometry to characterise hoof acceleration patterns during trotting on contrasting surfaces—tarmac and sand—examining three core questions: whether collision responses are consistent and predictable, the range of force directions acting on the hoof, and whether initial deceleration forces bring the hoof to near-zero velocity. On firm tarmac, collision dynamics proved deterministic and consistent with a spring-damper mechanical model; sand responses were predominantly random. Whilst the deceleration peak substantially slowed the hoof on sand, tarmac contact did not achieve near-zero velocity at this phase, and forces acted across a wide directional range on both surfaces. These findings suggest that viscoelastic structures within the foot function as shock absorbers, protecting the limb from extreme collision forces—a protective mechanism that warrants further investigation through both in vivo and in vitro studies. For practitioners, this work underscores the importance of considering how different track surfaces and shoeing choices may alter hoof-ground collision forces and subsequent loading on musculoskeletal tissues, establishing a foundation for linking lameness risk to functional hoof biomechanics.
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Practical Takeaways
- •Surface type significantly affects how the hoof experiences collision forces during landing—tarmac creates predictable mechanical stress patterns while sand is more variable, suggesting surface selection matters for injury prevention
- •The foot's natural shock absorption mechanisms work differently on different terrains; farriers and veterinarians should consider track surface properties when investigating lameness and designing therapeutic interventions
- •Shoe type and hoof care modifications may influence collision force transmission, warranting further research to optimize protection for horses working on different surfaces
Key Findings
- •Hoof-ground collision response on tarmac is deterministic and consistent with spring-damper system behavior, while sand response is predominantly random
- •Collision forces act on the hoof across a wide range of directions on both surfaces
- •Initial deceleration peak does not reduce hoof velocity to near-zero on tarmac but appears to on sand
- •Evidence suggests stiff, viscoelastic structures within the foot function as shock absorbers to isolate the limb from large collision forces