Despite widespread use of cementless fixation in total hip arthroplasty, there is still speculation as to the best approach. It is important to understand how parameters such as geometry, calcar-collar support, and biologic fixation may affect the load transfer and relative motion for these systems, not only in the short-term, but also in the long-term.

Detailed, three-dimensional finite element models were developed to address these issues. Two different prosthesis geometries were studied, and parameter studies on the amount of porous coating, calcar-collar support, and the external loads were performed. In each case, there were non-linear interface conditions between the bone and prosthesis.