WIT Press


Shape Optimization Of A Cementless Hip Stem

Price

Free (open access)

Paper DOI

10.2495/BIO030321

Volume

6

Pages

10

Published

2003

Size

369.59 kb

Author(s)

P. R. Fernandes & R. B. Ruben

Abstract

This work presents a development of a computational model for shape optimization of cementless hip stems. To improve the stability of the prosthesis, the optimization problem consists of the minimization of the relative displacements on bonelstem interface. The design variables are parameters that characterize the geometry of selected cross sections. These variables are subject to geometric constraints to ensure a clinically admissible shape. The stemlbone set is considered a structure in equilibrium with contact condition on interface. The contact formulation allows us to analyze different lengths of porous coating. The optimization problem is solved numerically by a steepest descent method where the sensitivity of objective function is computed using finite differences. The interface stresses and rel

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