Title

ULTRASONIC CHARACTERIZATION OF PMMA-CANCELLOUS BONE COMPOSITES.

Abstract

Total joint replacements, such as the total knee and total hip, consist of metal and polyethylene components which, until recently, were almost all held in place with orthopaedic polymethylmethacrylate cement (PMMA). Fixation is provided by mechanical interlock between the cement and the porous bone. When loosening of the prosthesis becomes a problem, it usually occurs at the interface between the PMMA and the surrounding cancellous bone. It is imperative that we have an accurate knowledge of the material properties of the interface composite layer. In this study, ultrasonic techniques were used to characterize the mechanical properties of the cement-bone composite. Using the model of an orthotropic material there are nine independent engineering constants for the composite material. Since the bone is heterogeneous, the mechanical property data was obtained as a function of volume fraction of bone.

Publication Title

American Society of Mechanical Engineers, Bioengineering Division (Publication) BED

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