PMID: 8945655Dec 1, 1996Paper

Subsidence of THA stems due to acrylic cement creep is extremely sensitive to interface friction

Journal of Biomechanics
N Verdonschot, R Huiskes

Abstract

Acrylic cement, used to fixate total hip arthroplasty (THA), creeps under dynamic and static loading conditions. As a result, THA stems which are debonded from the cement, may gradually subside, depending on their shape and surface roughness. The purpose of this study was to evaluate the relationship among dynamic load, creep characteristics, interface friction, and subsidence patterns. A laboratory model consisting of a metal tapered cone, surrounded by a cement mantle, was developed. The cone was gradually compressed in the cement by a dynamic, sinusoidal axial force, cycling between 0 and 7 kN for 1.7 million cycles at a frequency of 1 Hz. Subsidence and cement strain were monitored. Two tapers were tested in this way. The relationships among subsidence, creep properties and interface friction were evaluated from a finite element (FE) model, used to simulate the experiments. In this model, the creep properties obtained in dynamic and static, tension and compression experiments measured earlier, were used. The subsidence patterns of both tapers were similar, but one subsided more than the other (380 vs 630 microns). Both subsided stepwise instead of continuous, with a frequency much smaller than that of the applied load. The ...Continue Reading

Citations

May 22, 2002·Journal of Biomechanics·N Nuño, G Avanzolini
Aug 1, 1997·Journal of Biomechanics·N Verdonschot, R Huiskes
Jun 21, 2001·Clinical Biomechanics·P J Prendergast
Apr 15, 2006·International Orthopaedics·Ayumi KaneujiTadami Matsumoto
Jan 31, 2002·Acta Orthopaedica Scandinavica·L R WeidenhielmT W Bauer
Jul 4, 2007·Journal of Biomechanics·M J Gómez-BenitoM Doblaré

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