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Loading with vancomycin does not decrease gentamicin elution in gentamicin premixed bone cement.

Antibiotic loaded bone cements are used as drug delivery systems for the treatment of periprosthetic joint infections. They can be loaded with antibiotics during industrial component production (premixing) and during cement preparation (manually blending). Although double premixed antibiotic loaded bone cements are available, manually blending of a gentamicin premixed antibiotic loaded bone cement with vancomycin is still popular. We compared in vitro antibiotic elution and compressive strength of 0.5 g gentamicin premixed bone cement (PALACOS® R + G), 0.5 g gentamicin premixed bone cement (PALACOS® R + G) manually blended with 2.0 g vancomycin, 0.5 g gentamicin and 2.0 g vancomycin premixed bone cement (COPAL® G + V), 1 g gentamicin and clindamycin premixed bone cement (COPAL® G + C) and bone cement without an antibiotic (PALACOS® R) as control. Antibiotic concentration measurements were performed for 6 weeks and then compression strength was tested. Concentrations of gentamicin showed no significant differences between PALACOS® R + G, PALACOS® R + G with vancomycin and COPAL G® + V. After 48 h COPAL G® + C produced significantly higher gentamicin concentrations than the other formulations. After 12 h PALACOS® R + G with vancomycin produced significantly higher vancomycin concentrations, but had the lowest compression strength. We found no influence of vancomycin addition on gentamicin elution, irrespectively of the loading method. However, the manually vancomycin blended ALBC produced higher vancomycin concentrations. Compression strength after aging is reduced by loading with vancomycin.

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