Avaliação biomecânica, macroscópica e microestrutural de ossos longos de Cerdocyon thous (Linnaeus, 1766)
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Data
2020-02-18
Autores
Pastor, Felipe Martins
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Universidade Federal do Espírito Santo
Resumo
The aim of the present research was to perform the biomechanical, macroscopic and microstructural evaluation of crab-eating fox (Cerdocyon thous) long bones. In the first experiment, the prevalence of fractures in long bones was evaluated, characterizing them in their macroscopic and microstructural morphology, using 18 individuals. It was observed that 44% of the animals studied presented some fracture in long bones, more often, transverse and oblique in diaphysis, distributed equally in humerus, femur and tibia. Microscopically, diaphyseal fractures showed collagen fibers organized in an intermediate and longitudinal way in the osteonal lamellae, while the epiphyseal ones presented tissue disorganization, with multidirected and poorly organized fibers, with low cell activity in all cases. In the second experiment, the mechanical behavior and the influence of the microstructural characteristics in the three-point flexion test were studied, using 14 femurs and 15 left humerus. The humerus was more resistant, and the morphometric characteristics are capable of influencing the biomechanics in both bones. Microscopically, there was a predominance of osteons with intermediate and longitudinal fibers, and fractures occurred both by the deflection mechanism and by delamination, with low cell activity in both bones. No influence of mineral content on mechanical properties was observed. In the third experiment, the influence of the morphometric and microstructural characteristics in the axial compression test was compared, using 15 femurs and 15 right humerus. The humerus was more resistant than the femur, and its maximum strength was influenced only by the circumference of the diaphysis. Diaphyseal fractures of both bones showed intermediate collagen fibers, with rupture due to deflection, while epiphyseal fractures showed disorganization of collagen fibers, with low cell activity being observed in both cases. There is no influence of mineral content on mechanical properties.
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Biomecânica , Fraturas , Ossos