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Browsing by Author "Vale, Alberto"

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  • ITTA – Influência da torção tibial em AFO’s: recurso a tecnologia CAD e CAE
    Publication . Roldão, Manuel; Silva, Jorge; Viais, Tiago; Matos, José Pedro; Vale, Alberto
    Pertinência do estudo - PC: 2 em cada 1000 indivíduos → 53 mil ortóteses prescritas por ano (EUA); AVC: 15 milhões de pessoas por ano → 1/3 incapacidade física permanente; a alteração da posição neutra para a uma de dorsiflexão, a AFO irá ficar sujeita a uma fratura por stress de material na sua região posterior; a avaliação da torção tibial é importante para a deteção precoce de algumas doenças do aparelho locomotor bem como a orientação do prognóstico. Objetivo do estudo - Existe influência do valor da Torção Tibial na AFO?
    2018-06Conference object Open access Show more
  • Structural reinforcements on AFO’s: a study using computer aided designing and finite element method
    Publication . Gomes, Gonçalo; Lourenço, Inês; Oliveira, José; Gomes, Miguel; Vale, Alberto; Policarpo, Hugo; Quental, Paulo; Freire, Luís; Matos, José Pedro
    As state by the literature, is usual for thermoplastic AFO’s to open cracks as result of the undergoing stress forces of human gait. That mechanical stress forces trigger fractures areas on critical points, normally near the malleoli (see the picture below), as result as the range of movement of that specific region. David Showers and Lair David, claim that is possible to increase AFO’s resistence trough the inclusion of reinforcements (by waving the plastic) at the retromalleolar area. The purpose of this study is to verify the influence of the application of structural reinforcements has on the distribution of tension and deformation in an AFO in the stance phase of gait.
    2017-02Conference object Open access Show more
  • Structural reinforcements on AFO's: a study using computer-aided design and finite element method
    Publication . Gomes, Gonçalo; Lourenco, Inês; Oliveira, José; Gomes, Miguel; Vale, Alberto; Freire, Luís; Quental, Paulo; Policarpo, Hugo; Matos, José Pedro
    The opening of cracks on the lateral sides of AFO's is a common problem due to the stress forces applied during the gait cycle. The problem can usually be prevented with the inclusion of structural reinforcements in the expected cracking zone of the AFO. This study proposes an approach to evaluate the effect of the applied reinforcements to the AFO's, quantifying the stress forces and deformation experienced by the orthotic device during the stance phase of the gait. For that, a CAD file of an AFO had to be crated and then edited using CAD software (ANSYS® SpaceClaim® Direct Modeler™) in order to create a geometry suitable to be analyzed by a CAE software (ANSYS® Workbench™™ with the Finite Element Method (FEM). Besides the digital model, different input conditions, such as forces (for dynamic conditions), supports (for static conditions) and material properties were defined and analyzed.
    2017-03Journal article Restricted access Show more