Evaluating the redesign of a prosthesis joint using finite element analysis

Abstract

The Jaipur Foot is a prosthesis ideally suited for amputees in developing countries because it is made of inexpensive materials and focused on affordability and functionality. Studies have examined the areas of the Jaipur foot that present the greatest damage, but not the juncture between the high-density polyethylene tube and the prosthetic foot. This paper aims to evaluate different designs for the juncture between the Jaipur Foot and the tube of this exoskeletal prosthesis through finite element analysis. The geometry of the Jaipur foot was modeled using 3D scanning. Multiple simulations were conducted using finite elements, as well as a linear study to prove the convergence of the mesh and a nonlinear study that reproduced a variable load simulating the conditions during gait. The junction models that include multiple bolts presented failures due to maximum stresses on the wooden block and maximum displacements. On the contrary, the model with a single bolt did not fail, and the adhesive model turned out to be the best solution. The best juncture option is epoxy adhesive because the stresses are less concentrated. Therefore, the damage to that area can be more efficiently controlled, extending the lifetime of the prosthesis and improving its characteristics

References

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