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The effect of glycine filler on the elution rate of gentamicin from acrylic bone cement: a pilot study.

Elution of antibiotics from acrylic bone cement (polymethylmethacrylate [PMMA]) is dependent on the access of fluid to the depths of the cement that contains the antibiotic. Commercially prepared antibiotic beads that are porous have higher elution rates than hand-mixed, nonporous antibiotic PMMA mixtures. To increase the elution of gentamicin from hand-mixed PMMA, glycine was added as a filler to produce porosity. Elution of gentamicin from the antibiotic PMMA-glycine mixture increased with increasing amounts of glycine. With 3.6 g gentamicin powder and 14 g of crystalline glycine per batch of Palacos PMMA, the elution of gentamicin from the PMMA at 2 days was, similar to the previously documented elution of gentamicin from commercially prepared porous Septopal PMMA beads. With further investigation it may be possible to identify a specific filler and a volume of filler that can be hand mixed in antibiotic PMMA to produce the elution behavior that is needed for specific clinical requirements.

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