The effect of hoof angle variations on dorsal lamellar load in the equine hoof.
Authors: Ramsey G D, Hunter P J, Nash M P
Journal: Equine veterinary journal
Summary
# Editorial Summary: Hoof Angle and Dorsal Lamellar Load Raising the palmar angle of the distal phalanx is a widely adopted therapeutic approach in laminitis management, based on the premise that reducing deep digital flexor tendon tension will decrease load on the dorsal lamellae and facilitate healing. Ramsey and colleagues used detailed biomechanical finite element modelling to test this assumption, creating three-dimensional hoof models with palmar angles ranging from 0–15° and applying realistic loading conditions that replicate critical phases of stance and breakover. Contrary to conventional expectation, their models demonstrated that increasing palmar angle actually increased stored elastic energy—a proxy for tissue load—in the dorsal laminar junction, with energy levels at 15° palmar angle reaching 1.3 to 3.8 times those at 0°, particularly at the proximal laminar border. This finding fundamentally challenges current therapeutic protocols and suggests that aggressive heel elevation, whilst it may reduce joint moments at the coffin joint, paradoxically concentrates greater strain on the very structures laminitis damages. Farriers and veterinarians should consider these biomechanical predictions when deciding hoof care strategies for laminitic horses, potentially favouring more conservative angle adjustments or alternative interventions to unload the dorsal lamellae.
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Practical Takeaways
- •Current farriery practices of raising palmar angle to treat laminitis may increase rather than decrease load on the dorsal lamellae, potentially causing further damage
- •Alternative hoof care strategies for laminitis management should be reconsidered in light of these biomechanical findings
- •Proximal laminar junction is the primary site of increased stress with increased palmar angle—monitor this region closely in treated horses
Key Findings
- •Increasing palmar angle from 0° to 15° increased stored elastic energy in the dorsal laminar junction across all loading cases
- •Stored elastic energy at the proximal laminar junction border for 15° palmar angle was 1.3–3.8 times higher than at 0° palmar angle
- •Stored elastic energy at the distal laminar junction border remained small regardless of palmar angle
- •Raising the palmar angle does not reduce dorsal lamellae load, contradicting the common clinical assumption