Evaluation of silver nanoparticle-impregnated PMMA loaded with vancomycin or gentamicin against bacterial biofilm...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Orthopedic Surgery

Background:

• Conventional bone cements with vancomycin or gentamicin have limited antibiotic spectrum for orthopedic infections.
• Silver nanoparticles (AgNPs) offer broad-spectrum antimicrobial activity, including against multidrug-resistant bacteria.
• Biofilm formation by bacteria on implants is a major cause of orthopedic infections.

Purpose of the Study:

• To evaluate the efficacy of AgNP-loaded polymethylmethacrylate (PMMA) bone cement in inhibiting biofilm formation.
• To assess the combined effect of AgNPs and conventional antibiotics (vancomycin, gentamicin) in PMMA against common orthopedic pathogens.
• To investigate the impact of AgNP-PMMA on the viability of Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus epidermidis.

Main Methods:

• An in vitro model was used to quantitatively analyze biofilm production.
• Microorganisms tested included Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus epidermidis.
• The effect of AgNP-loaded PMMA, with and without vancomycin or gentamicin, on biofilm formation was assessed.

Main Results:

• AgNP-loaded PMMA combined with vancomycin or gentamicin significantly reduced bacterial colony-forming units (CFUs; p<0.001).
• AgNP-loaded PMMA alone did not demonstrate a significant reduction in biofilm formation.
• The combination therapy showed superior efficacy against most tested biofilm-forming bacteria.

Conclusions:

• AgNP-loaded PMMA demonstrates potential as an antimicrobial agent in orthopedic applications.
• The combination of AgNPs with vancomycin or gentamicin in PMMA enhances antimicrobial efficacy against biofilm-forming bacteria.
• This approach offers a promising strategy for combating challenging orthopedic infections.