CaracterizaÃÃo de um fÃmur sintÃtico empregando o mÃtodo dos elementos finitos e validaÃÃo por extensometria Ãtica / Characterization of a sintetic femur with the employment of the finite element method and validation by optical extensometry

AUTOR(ES)

Leandro Zen Karam

DATA DE PUBLICAÇÃO

2009

RESUMO

This work makes use of sensors based on fiber Bragg gratings, for the validation of a numerical model on the finite elements method of a synthetic femur, produced by SawbonesÂ. The numerical model was developed from a numerical model already used at the University of Aveiro. For validation, was developed a system for setting and implementation of load steps in the synthetic bone, so the forces were applied in a manner which arrive to approximated human femur in standing position. The results of the numerical model were similar to results in the literature. The test results were satisfactory and validated the numerical model. To complement the work in development, a synthetic femur was fractured in 45Âof the medial third, was used for fixing a osteosynthesis plate, as well as the number of screws, provided by Synthes Company. The fractured femur had been tested experimentally, and was created a numerical model for comparison, with similar behavior. We observed a strain concentration around the hole of the ostessyntesis plate, this exact spot of the outbreak of the fracture, and these strains about ten times larger than the strains in the region netween the holes, about 1.5 mm from the hole. Thus the positioning of the plate osteosynthesis during cirurgical intervention is of fundamental importance for the conduct of the process of repairing the fracture

ASSUNTO(S)

mÃtodo dos elementos finitos grades de bragg engenharia biomÃdica fÃmur fiber bragg gratings synthetic femur internal fracture fixation opitical detectors detectores Ãticos biomedical engineering fraturas - fixaÃÃo interna finite element method engenharia biomedica

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