Photoelastic stress analysis of strain patterns in equine hooves after four-point trimming
| Autor: | John A. Stick, Gary L. Cloud, Steven P. Arnoczky, Loïc M. Déjardin |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Photoelasticity
Hoof and Claw animal structures Materials science General Veterinary Hoof Strain (injury) General Medicine Anatomy medicine.disease Body weight Elasticity Biomechanical Phenomena Stress (mechanics) Ground contact Strain distribution Forelimb medicine Sprains and Strains Animals Trimming Horses |
| Zdroj: | American journal of veterinary research. 62(4) |
| ISSN: | 0002-9645 |
| Popis: | Objective—To evaluate changes in strain patterns in normal equine hooves following 4-point trimming, using photoelastic stress analysis. Sample Population—15 equine front limbs with normal hoof configuration. Procedure—Limbs were disarticulated at the carpometacarpal joint. Weight-bearing surfaces of each hoof were trimmed level to ensure 100% ground contact. Hoof walls were coated with a custom-made strain-sensitive plastic, and limbs were loaded to a third of body weight. Using a polariscope, strain distribution, magnitudes, and directions were evaluated in level hooves as well as before and after standardized 4-point trimming. Repeated-measures ANOVA was used to compare strain magnitudes and directions before and after trimming. Results—In leveled specimens, strain fields were symmetrically distributed above the heels and at quarter-toe junctions along a line between the middle and distal thirds of the hoof wall. After 4-point trimming, strain epicenters localized above the contact points, whereas strain magnitudes significantly increased by approximately 50%. Decreasing contact area by 50% resulted in an additional significant increase (32%) in strain magnitude. Trimming did not have a significant effect on strain orientations. Conclusion and Clinical Relevance—This study documents that 4-point trimming results in strain concentration above the hoof contact points and that strain magnitude is dependent on contact area. (Am J Vet Res 2001;62:467–473) |
| Databáze: | OpenAIRE |
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