Finite element analysis of the head–neck taper interface of modular hip prostheses. (November 2015)

• Record Type: Journal Article
• Authors: Dyrkacz, R.M.R.; Brandt, J.M.; Morrison, J.B.; O' Brien, S.T.; Ojo, O.A.; Turgeon, T.R.; Wyss, U.P.
• Is Part Of: Tribology international. Volume 91(2015)
• Page Start: 206
• Page End: 213
• Publication Date: 2015-11
• Subjects: Finite-element method -- Fretting -- Corrosive -- Contact; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2015.01.016
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: The purpose of this paper was to identify which parameters influence the micromotion at the head–neck taper interface of modular hip prostheses. Finite element analysis was performed where 3D models of the head–neck taper interface were subjected to an assembly force, 3300 N of compression, and 100 N of tension. The micromotion increased as the head size, assembly force, and taper size increased. The micromotion also increased when a mixed alloy material combination (CoCr head and Ti6Al4V neck) was used instead of all CoCr alloy prosthesis and when the center of the femoral head was in a more superior position relative to the center of the neck taper. Highlights: Finite element analysis was performed at the head–neck taper interface. An increase in head size, assembly force, and taper size increases micromotion. Heads and stems made out of CoCr have less micromotion than mixed alloy prostheses. More micromotion may occur by placing the center of the head in a superior position. Out of axis loading delivers more micromotion than axial loading.