Stiffness analyses of modified niagara prosthetic feet using finite element modelling

El-Mohandes, Mostafa Saied; Ibrahem, Mostafa El-Hussien

doi:10.1109/cibec.2014.7020953

Cited by 3 publications

(2 citation statements)

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“…1. The thickness "B" was altered by shifting the center of the outer semicircle horizontally from the center 0 by the distances of 5 mm, 10 mm and 15 mm to obtain the Models (nominated M1, M2, M3, and M4 respectively), so the values of "B" were 12.5, 17.5 mm, 22.5 mm and 27.5 mm respectively [4]. Other modifications were made on the four models (M1, M2, M3 and M4) which included removing the prongs, In order to study the effects of removing the prongs on the heel and the toe stiffness.…”

Section: A Foot Shape Modelmentioning

confidence: 99%

“…Therefore, the design of the prosthetic limb must take into account its stiffness characteristics in order to substitute for the loss of the tendons and muscles of the intact biological limb [2]. The structural stiffness as a characteristic of the prosthetic foot is not a single value, since it is not only based on the design, and the material of foot, but also on the attitude of loading which changes during the walk [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Finite Element based Model of Modified Niagara Foot and its Effect on Stiffness

Kandil¹

2016

IJCA

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A prosthetic foot-ankle system is designed with the purpose of improving the amputee gait by storing and releasing elastic energy during the stance stage of the gait. Such foot performance is based on its structural stiffness characteristics. Choosing the appropriate stiffness of a prosthetic foot is planned to substitute the loss of the muscles and tendons of the intact foot. The aims of this study are to study the effect of the thickness of the upper part of the S-shape and removing the prongs on the structural stiffness of a modified Niagara foot using the FEA. In this work, a simulated model based on finite element is built. Then, an analysis is conducted on the modified models of Niagara foot using the boundary conditions of the ISO-10328 and expanded using the boundary conditions of the ISO-22675 to study the effect of removing the prongs from the models. The stiffness results of the FEA are compared by considering the Kl, K2, and KH values. The prongs of the Niagara foot had a major contribution in force-displacement relationships. So, by removing these prongs, the stresses imposed in a foot due to loading the toe exceeded the yielding stress for the feet when proposing the Delrin 2700 or Hytrel 8238 materials. Also the absence of the prongs showed remarkable effects on the toe stiffness variation with the simulated time of stance, especially at the earlier stages of the toe contact where this effect diminished gradually up to the toe-off.

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Section: A Foot Shape Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%