Abstract
Purpose
The aim of the present study was to quantitatively assess biofilm growth on the surface of bone cements discs containing different antibiotics, including colistin and linezolid. Biofilms of methicillin-resistant Staphylococcus aureus (MRSA), Pseudomonas aeruginosa, and Staphylococcus epidermidis were grown on bone cement discs for 96 h.
Methods
Biofilm amounts were measured by confocal laser microscopy using live/dead staining and dedicated software at different time intervals (48, 72, and 96 h).
Results
Bone cement containing vancomycin was not effective at reducing MRSA biofilm formation 96 h following bacterial inoculation. At a comparable time interval, linezolid-, clindamycin-, and aminoglycoside-loaded cement was still active against this biofilm. At the 72- and 96-h observations, S. epidermidis biofilm was present only on tobramycin and gentamicin discs. P. aeruginosa biofilms were present on cement discs loaded with colistin at all time intervals starting from the 48-h observation, whereas no biofilms were detected on tobramycin or gentamicin discs.
Conclusion
Bone cements containing different antibiotics have variable and time-dependent windows of activity in inhibiting or reducing surface biofilm formation. The effectiveness of bone cement containing vancomycin against MRSA biofilm is questionable. The present study is clinically relevant, because it suggests that adding the right antibiotic to bone cement could be a promising approach to treat periprosthetic infections. Indeed, the antibiofilm activity of different antibiotic-loaded bone cements could be preoperatively assessed using the current methodology in two-stage exchange procedures.
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Abbreviations
- ALBC:
-
Antibiotic-loaded bone cement
- BHI:
-
Brain–heart infusion
- CLSM:
-
Confocal laser scanning microscopy
- 3D:
-
Three dimensions
- MRSA:
-
Methicillin-resistant Staphylococcus aureus
- PBS:
-
Phosphate-buffered saline
- PI:
-
Propidium iodide
- PMMA:
-
Polymethylmethacrylate
- SCVs:
-
Small colony variants
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GB, MRC, ER, OG, GG, and MM worked on conception and study design. GB, ER, and AV performed sample acquisition and data testing. All authors played a role in data analysis and interpretation. GB, ER, MRC, TA, and MM drafted the manuscript. All authors played a role in critical review and revision of final manuscript.
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Institutional Review Board (IRB) approval is not required due to in vitro study design.
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Balato, G., Roscetto, E., Vollaro, A. et al. Bacterial biofilm formation is variably inhibited by different formulations of antibiotic-loaded bone cement in vitro. Knee Surg Sports Traumatol Arthrosc 27, 1943–1952 (2019). https://doi.org/10.1007/s00167-018-5230-x
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DOI: https://doi.org/10.1007/s00167-018-5230-x