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Journal of Bone and Joint Infection An open-access journal of the European Bone and Joint Infection Society and the MusculoSkeletal Infection Society
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Volume 2, issue 4
J. Bone Joint Infect., 2, 213–217, 2017
https://doi.org/10.7150/jbji.22382
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Bone Joint Infect., 2, 213–217, 2017
https://doi.org/10.7150/jbji.22382
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Original full-length article 17 Nov 2017

Original full-length article | 17 Nov 2017

Influence of Sonication on Bacterial Regrowth from Antibiotic Loaded PMMA Scaffolds - An In-vitro Study

Martin Clauss1,2, Esther Laschkolnig3,4, Susanne Graf1,4, and Klaus-Dieter Kühn3 Martin Clauss et al.
  • 1Kantonsspital Baselland, Liestal, Interdisciplinary Unit for Orthopaedic Infections, Switzerland
  • 2Kantonsspital Baselland, Liestal, Clinic for Orthopaedics and Traumatology, Switzerland
  • 3Medical University of Graz, Austria
  • 4Kantonsspital Baselland, Liestal, Department for Microbiology, Switzerland

Keywords: Periprosthetic joint infection, bone cement, sonication, in vitro

Abstract. Periprosthetic joint infection (PJI) is one of the most challenging complications after joint replacement. However, when treated correctly, chances of recovery are good. The most important step in correct diagnosis and management of PJI is the detection of the causative germ. In the last years, the use of sonication in the diagnostic process has become more important. However, this diagnostic methodology has been controversially discussed when used in combination with antibiotic loaded bone cement (PMMA), which is frequently used in joint replacement surgeries. The aim of this study was thus to analyse in vitro bacterial growth in sonication fluid cultures obtained from antibiotic loaded PMMA which were contaminated with various bacterial biofilms.

Sonication fluid obtained from antibiotic loaded PMMA (Copal G+V and Copal G+C) and plain Palacos R (control) contaminated either with S. aureus, E. faecalis, S. sanguinis or P.acnes, were analysed for bacterial re-growth in a standardised in-vitro setting.

In vitro bacterial growth was not interfered by released antibiotics from sonication of antibiotic loaded PMMA for S. aureus, E. faecalis and S. sanguinis. However, for P. acnes bacterial counts were affected by the released antibiotics as well as by the time delay between sonication and analysis. The in-vitro data suggest sonication to be an easy and sensitive diagnostic modality to detect easy-to-detect bacteria, however, results are alarming for the difficult-to-detect bacteria P. acnes, indicating that further attention and research is necessary to improve the detection of difficult-to-detect bacteria.

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