Hip Prosthesis Design Using a Multi-Criteria Formulation View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2006

AUTHORS

Rui B. Ruben , Paulo R. Fernandes , João Folgado , Helder C. Rodrigues

ABSTRACT

Just after a Total Hip Arthrosplasty, the fixation of the cementless stem mainly depends on mechanical factors. If a good initial mechanical stability is achieved, new bone growths into the stem porous coating, leading to a desirable long-term biologic fixation. On the other hand, an inefficient primary stability could be painful for the patient and promotes aseptic loosening, the main cause of cementless stem failure. In fact, “small” relative displacements between bone and stem as well as “small” contact stresses promote bone ingrowth, while larger displacement and stress values can destroy it. Thus, the primary stability can be improved controlling the displacement and stress level at the bone-implant interface. Such improvement can be performed actuating on stem geometry, friction coefficient between bone and stem, surgery technique and biologic response of bone to stem material. This interface phenomenon occurs simultaneously with bone adaptation process due to stress shield effect. The bone remodeling around the stem is also decisive for prosthesis success and it is itself related with initial conditions, such as primary stability and host-bone quality. To address the problem of hip prosthesis initial stability, a three-dimensional shape optimization procedure is developed to obtain the optimal stem geometry. The model uses a multi-criteria formulation that permits simultaneous minimization of tangential displacement and contact stress on the bone-stem interface. Design variables are geometric parameters describing successive stem sections. These parameters are constrained in order to obtain clinically admissible shapes. The bone-stem set is considered a structure in equilibrium with contact conditions. The contact formulation with friction allows the analysis of different porous coating lengths. Coated surfaces are modeled as contact with friction (friction coefficient ) and uncoated surfaces as frictionless contact surfaces. A multiple load case, with three load cases, is also considered to simulate different daily life activities. The optimization problem was solved numerically by the method of moving asymptotes (MMA). The three-dimensional stem geometries obtained show the relation between geometry, porous coating length, relative tangential displacement and contact stress. This information leads to a better understanding of initial stability of a hip prosthesis and the relation between stem design and stability. More... »

PAGES

203-203

Book

TITLE

III European Conference on Computational Mechanics

ISBN

978-1-4020-4994-1
978-1-4020-5370-2

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/1-4020-5370-3_203

DOI

http://dx.doi.org/10.1007/1-4020-5370-3_203

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1008608962


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