NDLI: Multiscale Design and Multiobjective Optimization of Orthopaedic Cellular Hip Implants

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Khanoki, Sajad Arabnejad Pasini, Damiano
Copyright Year	2011
Abstract	A multiscale design and multiobjective optimization procedure is developed to design a new type of graded cellular hip implant. We assume that the prosthesis design domain is occupied by a unit cell representing the building block of the implant. An optimization strategy seeks the best geometric parameters of the unit cell to minimize bone resorption and interface failure, two conflicting objective functions. Using the asymptotic homogenization method, the microstructure of the implant is replaced by a homogeneous medium with an effective constitutive tensor. This tensor is used to construct the stiffness matrix for the finite element modeling (FEM) solver that calculates the value of each objective function at each iteration. As an example, a 2D finite element model of a left implanted femur is developed. The relative density of the lattice material is the variable of the multiobjective optimization, which is solved through the non-dominated sorting genetic algorithm II (NSGA-II). The set of optimum relative density distributions is determined to minimize concurrently interface stress distribution and bone loss mass. The results show that the amount of bone resorption and the maximum value of interface stress can be reduced by over 70% and 50%, respectively, when compared to current fully dense titanium stem.
Sponsorship	Design Engineering Division and Computers and Information in Engineering Division
Starting Page	935
Ending Page	944
Page Count	10
File Format	PDF
ISBN	9780791854822
DOI	10.1115/DETC2011-47487
Volume Number	Volume 5: 37th Design Automation Conference, Parts A and B
Conference Proceedings	ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
Language	English
Publisher Date	2011-08-28
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Hip joint prostheses Prostheses Stress concentration Pareto optimization Density Modeling Optimization Stress Genetic algorithms Design Blocks (building materials) Finite element model Tensors Orthopedics Titanium Stiffness Bone Finite element analysis Failure
Content Type	Text
Resource Type	Article

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