Comparison of bending modulus and yield strength between outer stratum medium and stratum medium zona alba in equine hooves.

This study investigates the differences in bending modulus and yield strength between two parts of the equine hoof — outer stratum medium (SM) and stratum medium zona alba (SMZA). The researchers used 10 normal equine feet for this comparison, applying a 3-point bending technique for their experiment. They found significant differences between the two parts of the hoof, highlighting a potential functional role for the SMZA in protecting other hoof tissues.

Experimental Method

• The research was carried out on 10 normal equine feet. The feet were tested using a 3-point bending technique to determine the bending modulus and yield strength of the outer SM and SMZA.
• The method involved applying a load at the middle of a given sample while it was supported at its ends in order to determine its resistance to deformation.
• In an attempt to minimize variability and potential bias, care was taken to control for biological and technical factors that might influence the bending modulus, such as sample preparation and testing conditions.

Results

• For the outer SM, the mean bending modulus was 187.6 ± 41.3 MPa, while for the SMZA, it was significantly lower, at 98.2 ± 36.8 MPa.
• The mean yield strength was also significantly higher for the outer SM (19.4 ± 2.6 MPa) compared to the SMZA (5.6 ± 1.7 MPa).
• Significant differences were not found when the outer SM was loaded in bending from the outer or inner surface, testifying to its mechanical consistency.

Conclusions

• The research suggests a potential role for the SMZA as a mechanical buffer zone in the equine hoof. It appears to help mediate forces between the rigid hoof wall and internal bone and laminar tissues.
• The buffer zone likely enables horse feet to more effectively transmit load, safeguarding the most vulnerable tissues from injury.
• However, the study emphasizes a need for greater consistency in tissue selection, preparation, and testing protocols in order to refine this line of research. This would help construct a more accurate 3-dimensional finite-element model of an equine foot.