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Dependence of the pullout behaviour of pedicle screws on the screw-hosting material relative deformability

CHATZISTERGOS, Panagiotis and Spyrou, Charidimos and Magnissalis, Evangelos and Kourkoulis, Stavros (2013) Dependence of the pullout behaviour of pedicle screws on the screw-hosting material relative deformability. International Journal of Computer Aided Engineering and Technology, 5 (4). pp. 343-361. ISSN 1757-2665 (In Press)

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Abstract or description

Indications exist in literature that a screw’s pullout behaviour is among others influenced by the relative deformability of the screw and its hosting material. In addition it is known that the stress field developed in the vicinity of an orthopaedic implant significantly influences bone remodelling. In this context an experimentally validated finite element model of a screw and its hosting material was employed for the study of the pullout phenomenon. The results indicated that the stress distribution within the screw’s hosting material is strongly influenced by the ratio of the screw’s elastic modulus over the respective one of its hosting material. In addition it is concluded that an optimum value of this ratio exists for which the stresses are more uniformly distributed along the length of the screw improving this way the pullout behaviour, and therefore the overall mechanical response, of the ‘screw-hosting material’ complex.

Item Type: Article
Uncontrolled Keywords: pedicle screw; pullout; relative deformability; mechanical compatibility; finite element analysis; synthetic bone; shear yield strength; stress distribution; optimum stiffness
Subjects: B800 Medical Technology
G900 Others in Mathematical and Computing Sciences
H300 Mechanical Engineering
H900 Others in Engineering
Faculty: Previous Faculty of Health Sciences > Psychology, Sport and Exercise
Depositing User: Panagiotis CHATZISTERGOS
Date Deposited: 11 Feb 2013 16:14
Last Modified: 20 Sep 2013 09:51
URI: http://eprints.staffs.ac.uk/id/eprint/486

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