Development of a 3D model of the equine distal forelimb and of a GRF shoe for noninvasive determination of in vivo tendon and ligament loads and strains.
Authors: Rollot Y, Lecuyer E, Chateau H, Crevier-Denoix N
Journal: Equine veterinary journal
Summary
# Editorial Summary Rollot et al. (2004) developed an innovative 3D biomechanical model of the equine distal forelimb combined with a ground reaction force recording shoe (GRF-S) to non-invasively measure actual tendon and ligament loads and strains during locomotion—a critical capability given that high-speed exercise and impact events during racing and jumping are implicated in tendinopathy development. The researchers validated their model by applying compression loads of 500–6000 N to cadaveric forelimbs fitted with ultrasonic kinematic markers, recording bone segment trajectories and the precise anatomical positions of tendon and ligament insertions, whilst the GRF-S captured three-dimensional ground reaction forces via four axis-specific force sensors embedded between shoe layers. Their findings demonstrated that soft ground surfaces (sand and rubber) significantly reduced ground reaction force amplitude and impact-related vibrations compared to hard ground, with stance phase duration increasing measurably on soft sand at equivalent speeds, whilst the model successfully quantified superficial digital flexor tendon strains and differentiated the contributions of the proximal interphalangeal joint to sesamoidean ligament loading. This integrated approach offers equine professionals a robust methodology for objectively evaluating how ground conditions, farriery choices, and shoe designs influence tissue loading patterns, enabling more evidence-based decisions regarding lameness rehabilitation, performance optimisation, and injury prevention strategies tailored to individual horses and training environments.
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Practical Takeaways
- •Soft footing (sand/rubber) may reduce mechanical stress on tendons and ligaments by lowering impact forces, potentially aiding in injury prevention and lameness recovery.
- •This GRF-shoe tool enables objective quantification of how ground and shoe combinations affect comfort and propulsion efficiency—useful for identifying optimal surfaces for individual horses.
- •Understanding how forelimb joint mechanics and hoof orientation influence tendon/ligament loading can guide farriery and training decisions for high-risk activities like racing and jumping.
Key Findings
- •A 3D biomechanical model successfully validated by comparing calculated and measured superficial digital flexor tendon strains during compression cycles of 500–6000 N.
- •Soft grounds (sand and rubber) reduced ground reaction force amplitude and diminished impact bounces and vibrations compared to hard ground.
- •Stance phase duration was longer on soft sand than hard ground at comparable speeds.
- •A ground reaction force recording shoe successfully differentiated the three components of GRF across different surfaces, with greater variability on hard ground.