Microcracks and Mechanical Behaviour of Corio-Epidermal Junction of Equine Hoof

Kochová, Petra; Tonar, Zbyněk; Witter, Kirsti; Cimrman, Robert; Mezerova, J.

doi:10.4028/www.scientific.net/kem.465.342

Cited by 2 publications

(2 citation statements)

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“…As previously described [8], the rupture of the laminar junction on application of critical tensile force is not in the dermal or epidermal region and does not follow the basement membrane. The study compared the real number of intersections between rupture profile and basement membrane (Fig 7) and the theoretical one based on length density of secondary lamellae, and no significant differences were observed.…”

Section: Discussionmentioning

confidence: 66%

“…It is well known that the structure and complexity of the lamellae of the laminar junction differs depending on the age of the horse, hoof wall region and hoof geometry [2,6,7]. However, to our knowledge, the correlation of quantitative parameters of this lamellar structure with the mechanical properties of the laminar junction has not yet been studied, except for correlations of the structure of primary laminar junction lamellae with stresses obtained by a finite element model [2], and the origin of microcracks and mechanical behaviour of the laminar junction [8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A preliminary study into the correlation of stiffness of the laminar junction of the equine hoof with the length density of its secondary lamellae

Kochová

Witter

Cimrman

et al. 2012

Equine Veterinary Journal

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Summary Reason for performing study: The relationship between mechanical behaviour and microscopic structure of the laminar junction of equine hooves under testing conditions requires elucidation. Objectives: To determine mechanical parameters and 2D length density of profiles of secondary lamellae of the laminar junction in the dermal region and to assess possible correlations. Methods: Specimens (25 samples in total) of the laminar junction were taken from front, quarter and heel parts from 3 equine hooves and exposed to a uniaxial tensile test until rupture to obtain Young's moduli of elasticity, ultimate stress and strain. Neighbouring specimens to those used for the biomechanical experiment were processed histologically to assess the length density of laminar junction basement membrane using stereological grids. Results: The estimated median (interquartile range) length density of the laminar junction basement membrane was 0.024 (0.020–0.027)/µm. Young's modulus of elasticity was 0.15 (0.11–0.35) MPa in the small deformation region, and 7.58 (6.14–8.68) MPa in the linear region was. The ultimate stress was 1.67 (1.41–2.67) MPa, and the ultimate strain was 0.50 (0.38–0.70). The Young's modulus of elasticity in the region of small deformations has a moderate correlation with the length density of the laminar junction basement membrane. Conclusions: As with most soft biological tissues, the laminar junction has a nonlinear mechanical behaviour. Within the range of small deformations, which correspond to physiological loading of the laminar junction, a higher length density of the laminar junction basement membrane is correlated with a higher resistance of the laminar junction against high stresses transmitted from the distal phalanx to the hoof wall. Potential relevance: The condition of the laminar junction apparatus may be easily quantified as the length density of profiles of secondary dermal lamellae. This quantification provides a simple tool that could be used for comparing the proneness of the various parts of the laminar junction to initial stages of laminitis.

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Section: Discussionmentioning

confidence: 66%