Initial peri- and postoperative antibiotic treatment of infected nonunions: results from 212 consecutive patients after mean follow-up of 34 months
2018
Infected
nonunionsof the
long bonesbelong to the most feared complications in the field of orthopedic and
trauma surgery. Optimal antibiotic therapy should start early with the first revision surgery. Therefore, the aim of this study was to evaluate our peri- and postoperative antibiotic regime in context with the microbial spectrum and antibiotic resistances of patients with infected
nonunionsand to assess the possible impact on healing rates.We included all patients with first revision surgery during 2010-2015 due to
nonunionof
long boneswith a clinical history of infection treated with radical debridement, local application of a
gentamicin-impregnated
bone cement, and systemic
cefuroxime. Mean follow-up was 34.2 months. Data collection was performed retrospectively using a computerized databank with information about microbial species from intraoperatively acquired tissue samples and respective
antibiograms. Bone fusion rates were evaluated based on findings of the latest X-rays and computed tomography scans.Two hundred and twelve patients with
nonunionand history of infection were selected; 171 patients had positive intraoperative microbial evidence of infection. Bacterial testing was mostly positive in fractures of the tibia (47.4%) and the femur (27.5%). Coagulase-negative Staphylococcus spp. were the most frequently detected (44.4%) followed by mixed infections (18.7%) and Staphylococcus aureus (10.5%).
Antibiogramsrevealed that 62.6% of our cases were
cefuroximesensitive; 87.7% were
gentamicinsensitive. Only 10.5% showed resistance to both
cefuroximeand
gentamicin. There was no statistically significant difference of fusion rates between patients with different microbial species or different antibiograms.Our data suggest that besides the high variety of different detected species, initial antibiotic treatment with a combination of systemic
cefuroximeand local
gentamicin-loaded
bone cementis effective and in almost 90% the later determined microbial infection was sensitive to this treatment. Therefore, we recommend initial treatment according to this algorithm until specific
antibiogramsare available from intraoperatively acquired tissue samples.
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