MODULUS AND STRENGTH OF PMMA-CANCELLOUS BONE COMPOSITES.

Abstract

Total joint replacements generally involve implantation of metal and polyethylene components which are held in place by PMMA cement. Loosening of the components often occurs at the interface between the cement and bone due to failure of the fixation of the cement to the bone. Although deeper penetration of the cement into the interstices of cancellous bone should improve the mechanical interlock, subsequent bone resorption may result due to the modulus mismatch between cancellous bone and cement. Since the interface between the cement and cancellous bone is a composite of cement and bone, it would appear that the modulus should be bounded by the rule of mixtures formulas. The compressive modulus and strength of the composite layer is experimentally determined, and the usefulness of the rule of mixtures formulas in predicting the modulus is examined.

Publication Title

Bioengineering, Proceedings of the Northeast Conference

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