Ground Reaction Force in Application
Authors: Cody Gregory A.W.C.F.
Journal: FWCF Fellowship Thesis
Summary
# Editorial Summary: Ground Reaction Force in Horseshoe Design Understanding how the foot responds to impact forces has long challenged farriers seeking to optimise shoeing for performance and soundness. Cody Gregory's Fellowship thesis addresses this gap by investigating whether deliberate variations in shoe web-width can manipulate ground reaction forces more effectively than conventional wedge angles. Through both controlled laboratory testing of machined shoes and in vivo measurement of ten horses across 320 recorded gait cycles using Hoof Beat technology, Gregory compared GRF-based designs against traditional 3.0° lateral wedges on varied surfaces. The key finding—that asymmetric web-width positioning can match or exceed the effects of standard lateral wedging, with branch placement emerging as the critical variable—suggests farriers have an additional mechanical tool beyond angle modification. Since the research also demonstrated that GRF effectiveness increases at higher speeds due to changes in ground surface dynamics, these results have practical implications for sport horses and performance applications where subtle biomechanical adjustments may influence limb loading patterns and long-term joint health.
Practical Takeaways
- •Web-width disparity in shoe design offers a GRF-based alternative to traditional wedge methods that may provide equal or superior effects for foot balance
- •The placement and position of the wider branch of the shoe is critical—this design parameter should be carefully considered when applying GRF principles to individual horses
- •GRF-based shoe designs become progressively more effective as horses move faster, suggesting they may be particularly beneficial for working horses and those moving at speed
Key Findings
- •Shoes with web-width disparity can achieve similar or greater effects than a 3.0° lateral wedge in influencing ground reaction force
- •Position of the wide branch in the shoe is a critical factor in the shoe's ability to influence GRF
- •As speed increases, granular flow dynamics change in a way that makes GRF-based shoe design more effective
- •In vivo study produced 320 unique measurements across 10 horses using Hoof Beat measurement system