Measures of micromotion in cementless femoral stemsreview of current methodologies

Giovanni F Solitro, Keith Whitlock, Farid Amirouche and Catherine Santis

Abstract

Stability and loosening of implanted femoral stems in Total Hip Replacement have been well established as barriers to the primary concerns of osseointegration and long term implant survival. In-vitro experiments and finite element modeling have for years been used as a primary tool to assess the bone stem interface with variable methodologies leading to a wide range of micromotion, interference fit and stress shielding values in the literature. The current study aims to provide a comprehensive review of currently utilized methodologies for in-vitro mechanical testing as well as finite element modeling of both micromotion and interference of implanted femoral stems. A total of 12 studies detailed in 33 articles were selected for inclusion. Experimental values of micromotion ranged from 12 to 182

Key Words

femoral stem; micromotion; cadaveric testing; finite element modeling; interference fit

Address

Giovanni F Solitro and Farid Amirouche: Department of Orthopaedic Surgery, University of Illinois at Chicago, 835 South Wolcott Ave. Chicago, IL, USA Keith Whitlock: College of Medicine, University of Illinois at Chicago, USA Catherine Santis: Department of Mechanical Engineering, University of Illinois at Chicago, USA

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