title: Constitutive models for impacted morsellised cortico-cancellous bone.
abstract: Constitutive models are developed, based on the results of confined compression testing, to describe the visco-elastic, and non-linear elasto-plastic behaviour of morsellised cortico-cancellous bone (MCB). It is found that the elastic modulus, E of MCB can be expressed as a linear function of the applied pressure, p. E varied from 3 to 30N/mm(2) for pressures up to 1N/mm(2). The visco-elastic behaviour of MCB can be described using a fourth-order Prony series. The plastic behaviour of MCB can be described using a Drucker Prager Cap (DPC) yield criterion, in which consolidation behaviour is described using an exponential function. The developed relationships allow MCB to be included in a realistic manner in finite element models, for example of the acetabular construct, following revision hip arthroplasty, carried out using the Slooff-Ling impaction grafting technique.
authors.affiliation: School of Engineering and Electronics, The University of Edinburgh, Edinburgh, Scotland, UK. andrew.philips@ed.ac.uk
authors.forename: Andrew
authors.initials: A
authors.lastname: Phillips
authors.forename: Pankaj
authors.initials: P
authors.lastname: Pankaj
authors.forename: Fraser
authors.initials: F
authors.lastname: May
authors.forename: Kenneth
authors.initials: K
authors.lastname: Taylor
authors.forename: Colin
authors.initials: C
authors.lastname: Howie
authors.forename: Asif
authors.initials: A
authors.lastname: Usmani
mesh_terms: D018786:Bone Substitutes; D019245:Compressive Strength; D003198:Computer Simulation; D004548:Elasticity
chemical_list: D018786:Bone Substitutes