Histologic characterization of the laminar interface at the crena marginis solearis
Authors: Burns
Journal: FWCF Fellowship Thesis
Summary
# Crena Marginis Solearis and White Line Disease: Structural Vulnerability in the Equine Hoof Burns' histological examination of eight equine cadaver forefeet reveals a striking correlation between crena marginis solearis (a developmental indentation at the bearing edge) and compromised laminar integrity. All six horses presenting with crena showed consistent white line disease in the toe region alongside marked disorganisation of the primary and secondary lamellae, whereas the two control horses displayed normal laminar morphology and disease-free hoof capsules. The pathological architecture at the crena site is characterised by primary epidermal lamellae lacking secondary lamellae and instead filled with tubular horn-like material—a structural deviation that fundamentally weakens the dermal-epidermal interface at this critical load-bearing location. For practitioners, these findings underscore the importance of regular monitoring in affected horses, as the compromised laminar interface substantially increases susceptibility to white line disease and dorsodistal hoof wall cracks. Understanding this anatomical predisposition may refine management protocols, particularly regarding farriery interventions and preventative therapeutic shoeing in horses with crena, helping clinicians address the mechanical vulnerability underlying these horses' hoof pathologies.
Practical Takeaways
- •Horses presenting with crena marginis solearis require heightened monitoring for white line disease development, particularly in the toe region
- •The compromised laminar interface structure in affected horses predisposes them to dorsodistal hoof wall cracks; farriers and veterinarians should implement preventive trimming and management strategies
- •Understanding the histologic basis for aberrant laminar architecture in crena cases helps explain clinical hoof pathologies and informs treatment decisions
Key Findings
- •All 6 horses with crena marginis solearis exhibited white line disease in the toe region with marked laminar disorganization, compared to normal morphology in 2 control horses
- •The laminar interface at the crena demonstrated abnormal architecture with primary epidermal lamellae lacking secondary lamellae and filled with tubular horn-like material
- •Disorganized laminar architecture in horses with crena marginis solearis may explain increased susceptibility to white line disease and hoof wall cracks