This retrospective study is to analyse microbiological cultures from the sonication fluid of the explanted prothesis to detect bacteria in the biofilm on the implant surface and to investigate whether the number of bacteria in the biofilm correlates with the duration of the PJI respectively with the period between symptom onset and date of revision surgery.
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number of bacteria
Timeframe: one time assessment at baseline
duration of the infection
Timeframe: one time assessment at baseline