caa a22 4500 463243684 CHVBK 20180405153319.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s00158-006-0072-4 doi (NATIONALLICENCE)springer-10.1007/s00158-006-0072-4 Three-dimensional shape optimization of hip prostheses using a multicriteria formulation [Elektronische Daten] [Rui Ruben, João Folgado, Paulo Fernandes] A multicriteria optimization model is developed to obtain the optimal geometry of the femoral component of a hip prosthesis. The objective function minimizes both the relative tangential displacement and the contact normal stress. For cementless stems, these two factors are relevant for the prosthesis stability and therefore for the implant success. The three-dimensional optimization procedure developed allows us to characterize the stem shape that minimizes displacement and stress individually, or simultaneously using a multicriteria approach. Design variables characterize successive stem sections, and are subjected to linear geometric constraints to obtain clinically admissible geometries. Multiple loads are considered to incorporate several daily life activities. The system bone-stem is considered a structure in equilibrium with contact condition on the interface. Results show that thin stem tips minimize the interface stress while collared stems minimize displacement. The multicriteria formulation leads to balanced solutions. Springer-Verlag Berlin Heidelberg, 2007 Shape optimization nationallicence Multicriteria optimization nationallicence Biomechanics nationallicence Hip prosthesis nationallicence Stem stability nationallicence Contact analysis nationallicence Ruben Rui School of Technology and Management, Polytechnic Institute of Leiria, Leiria, Portugal aut Folgado João IDMEC, IST, Av. Rovisco Pais, 1049-001, Lisbon, Portugal aut Fernandes Paulo IDMEC, IST, Av. Rovisco Pais, 1049-001, Lisbon, Portugal aut Structural and Multidisciplinary Optimization Springer-Verlag 34/3(2007-09-01), 261-275 1615-147X 34:3<261 2007 34 158 https://doi.org/10.1007/s00158-006-0072-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00158-006-0072-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ruben Rui School of Technology and Management, Polytechnic Institute of Leiria, Leiria, Portugal aut NATIONALLICENCE 700 1- Folgado João IDMEC, IST, Av. Rovisco Pais, 1049-001, Lisbon, Portugal aut NATIONALLICENCE 700 1- Fernandes Paulo IDMEC, IST, Av. Rovisco Pais, 1049-001, Lisbon, Portugal aut NATIONALLICENCE 773 0- Structural and Multidisciplinary Optimization Springer-Verlag 34/3(2007-09-01), 261-275 1615-147X 34:3<261 2007 34 158 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer