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Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_23 | Pages 34 - 34
1 Dec 2016
Gbejuade H Hidalgo-Arroy A Sayers A Leeming J Lovering A Blom A Webb J
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Aim

To evaluate the ability of different combinations of antibiotic loaded cement to inhibit bacteria growth and biofilm formation.

Method

Cement beads were aseptically prepared using Palacos R (plain 40g PMMA cement) or Palacos R+G (40g PMMA cement containing industrially added 0.5g of gentamicin), with or without supplementary antibiotics as follows: Palacos R; Palacos R+G; Palacos R plus 1g / 2g daptomycin; Palacos R+G plus 1g / 2g of daptomycin; Palacos R plus 1g / 2g vancomcyin; and Palacos R+G plus 1g / 2g vancomycin. After production, each antibiotic loaded acrylic cement (ALAC) combination was allocated into two groups (group 1 and 2).

The group 2 cement beads were initially eluted in broth at 37o C for 72hours then transferred to fresh broth containing a known concentration of bacteria. The group 1 samples were not eluted but directly immerse in culture broth containing bacteria. All samples were thereafter incubated at 37oC for 24 hours. After incubation, group 1 samples were visually assessed for bacterial growth, while for the group 2 samples, biofilm formation were quantified using ultrasonication and viable bacteria counting technique. Three proficient biofilm forming Staphylococcus epidermidis bacterial strains (1457, 1585-RA and 5179-R1) were used for all experiments and the bacteria counts were expressed as colony forming units / ml (CFU/ml).