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

Sebastian P Boelch1, Martin C Jordan2, Joerg Arnholdt3

  • 1Julius-Maximilians University Wuerzburg, Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, 11 Brettreichstrasse, D-97074, Wuerzburg, Germany. s-boelch.klh@uni-wuerzburg.de.

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PubMed
Summary
This summary is machine-generated.

Antibiotic-loaded bone cements (ALBCs) are crucial for treating periprosthetic joint infections. Manual blending of vancomycin with gentamicin-loaded cements resulted in higher vancomycin elution but reduced compression strength.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Infectious Diseases

Background:

  • Antibiotic-loaded bone cements (ALBCs) serve as vital drug delivery systems for periprosthetic joint infections.
  • ALBCs can be prepared via industrial premixing or manual blending during cement preparation.
  • While double premixed options exist, manual blending of gentamicin-ALBC with vancomycin remains common practice.

Purpose of the Study:

  • To compare the in vitro antibiotic elution profiles and compressive strength of different ALBC formulations.
  • To evaluate the impact of manual blending versus premixing on antibiotic release and cement integrity.
  • To assess the elution of gentamicin and vancomycin from various ALBC combinations.

Main Methods:

  • Tested five bone cement formulations: gentamicin-premixed (PALACOS® R+G), gentamicin-premixed with manually blended vancomycin (PALACOS® R+G + vancomycin), and two double-premixed cements (COPAL® G+V, COPAL® G+C), plus a control (PALACOS® R).
  • Measured antibiotic concentrations in vitro over six weeks.
  • Assessed compressive strength after antibiotic elution testing.

Main Results:

  • Gentamicin concentrations showed no significant differences between PALACOS® R+G, PALACOS® R+G with vancomycin, and COPAL® G+V.
  • COPAL® G+C exhibited significantly higher gentamicin concentrations after 48 hours.
  • PALACOS® R+G with vancomycin showed higher vancomycin concentrations after 12 hours but had the lowest compressive strength; manual blending yielded higher vancomycin elution. Vancomycin addition reduced compression strength.

Conclusions:

  • Manual blending of vancomycin with gentamicin-ALBC can achieve higher vancomycin elution but compromises mechanical integrity.
  • Specific premixed formulations (COPAL® G+C) may offer superior gentamicin release kinetics.
  • The choice of ALBC preparation method impacts both drug delivery and mechanical properties, crucial for clinical success.