An investigation of hoof mechanism characteristics following the application of wire trackers for various shoeing treatments
Authors: Fennell
Journal: FWCF Fellowship Thesis
Summary
# Editorial Summary Fennell's 2022 Fellowship thesis employed an in vitro biomechanical model to quantify hoof mechanism behaviour under load across four distinct treatment conditions: unshod, shod, shod with frog support pads, and shod with poured polyurethane material. Using nine externally placed wire trackers on 22 equine front limbs subjected to 25-tonne compression cycles whilst simultaneously video-recorded, the researcher captured detailed kinematic data on caudal hoof deformation and analysed it through custom Python motion-tracking software. The most significant finding concerns frog mechanics: whilst shoeing treatments did not substantially influence lateral and medial wall tracker movement, they were a statistically significant predictor of frog tracker displacement—suggesting that therapeutic shoeing interventions directly modify frog loading and mechanism. Conversely, hoof moisture emerged as a dominant variable affecting overall hoof mechanism, with drier hooves showing greater wall tracker movement whilst paradoxically exhibiting reduced frog movement; this inverse relationship indicates that moisture state fundamentally alters the mechanical properties and load distribution within the hoof capsule. For equine professionals, these findings underscore that therapeutic shoeing decisions—particularly those incorporating frog support—actively modulate hoof mechanism rather than merely providing static support. However, the moisture-dependent response suggests that environment, seasonal variation, and hoof hydration status warrant consideration alongside shoeing protocol when predicting clinical outcomes. Further investigation into the clinical correlation between these in vitro mechanics and ridden performance or lameness resolution would strengthen translational application of this work.
Practical Takeaways
- •Frog support and polyurethane materials appear to influence caudal hoof mechanism during weight-bearing, particularly frog engagement—consider their use when addressing frog-related biomechanical concerns
- •Hoof hydration state affects how the hoof structures move under load; maintain appropriate moisture levels to optimize mechanism function for the desired outcome
- •Wire tracker methodology provides measurable objective data on hoof deformation—this approach may help farriers validate trimming and shoeing decisions for individual cases
Key Findings
- •Shoeing treatments significantly predicted movement of the frog tracker but not lateral and medial trackers 1-4 and 6-9 in compression cycles
- •Increased hoof moisture resulted in decreased tracker movement on lateral and medial aspects, but increased movement of the frog tracker
- •Hoof mechanism responds to both unshod and shod treatment variations within specific parameters requiring further research