Finite element analysis of the head-neck taper interface of modular hip prostheses

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.