Características Mecánicas Dinámicas del Fémur Aislado de Perro, Sometido a Prueba de Impacto

Abstract

This paper is intended to provide information about biomechanical behavior femur at impact using the Charpy test method relating the resistance in the following areas: total, cortical and medullary bone cavity, comparing these between different ages and sexes. Dog femors were used in isolated conditions, removed postmortem from 30 adult animals, defined raceless, from the zoonoses service of the city of Rio Cuarto. Weight, total bone length, cranio-caudal diameter and lateral medial half of the diaphysis, were determined in the left and right femur. The left femur was osteotomized transversely in the middle of the diaphysis. In the sectional area thickness of the cortical and medullary diameters were measured. We obtained the total sectional area, cortical and medullary. The femur of the right lower limb was subjected to the Charpy test method. Results were statistically analyzed and found that cortical area depends linearly on the length of the bone (r=0.62, p=0.00025), bone strength depends on the cortical areas (r=0.71, p=0.00012) and total (global) areas (r=0.63, p=0.00021) and not of the medullary area (r=0.29, p=0.12). Exploratory analysis showed that no difference existed regarding age and sex influence on the strength of the femur. Following these results we can infer that as cortical area increases, the impact energy absorbed also increases.