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Objectives: One-stage replacement arthroplasty for treatment of periprosthetic joint infection (PJI) results in similar cure rate than two-stage (around 85-92%), but antibiotic therapy duration is not well established. The aim of this study was to evaluate the efficacy of a short six-week antibiotic course in periprosthetic joint infections after onstage exchange., Patients and Methods: Retrospective, observational study conducted at Orthopaedic Department of Cochin Hospital, Paris, between 1st January 2010 and 31 December 2015. Patients with a microbiologically proven PJI, treated with one-stage replacement and 6 weeks (+/1week) of antimicrobial therapy were included. Pearson's-χ 2 and Wilcoxon tests were used to compare categorical and continuous variables., Results: Fifty patients with periprosthetic joint infections (42 hip, 8 knee PJI) treated with one-stage replacement arthroplasty were included. Median age was 69.3 years (IQR 24.5-97.4). Infections occurred after a mean of 36 months (IQR 1-216). Bone biopsy cultures were positive for Staphylococcus spp. in 29 patients (58%), Cutibacterium acnes in 19 (38%), Gram-negative bacilli in 6 (12%). Polymicrobial infections occurred in 12 (24%). Intravenous antibiotics were administered for a median of 11 days (IQR 4-45) and 46 patients (92%) were switched to an oral therapy. Medium follow-up was of 32 months (IQR 12-101). Overall remission rate was 90%., Conclusions: A six-week course of antibiotics in knee and hip PJIs treated with one-stage RA has a satisfactory remission rate in this open study., (Copyright © 2020 Elsevier Masson SAS. All rights reserved.)

Introduction: Surgical resection of a malignant bone tumor (BT) or soft tissue tumor (STT), with or without prosthetic replacement, carries a high risk of developing postoperative infections. There is limited knowledge on the bacteriological spectrum of these postsurgical infections that necessitate empirical antibiotic therapy. The aim of this study was to analyze the incidence and microbiological features of site infections following BT or STT resection., Methods: In this retrospective mono-center study, we analyzed the surgical and bacteriological data of all consecutive patients who developed an infection after surgical resection of a BT or STT between January 2010 and April 2014., Results: Seventy-two consecutive patients who developed an infection on the site of surgical treatment for a BT (n = 42) or SST (n = 30) were included. Polymicrobism was frequently observed, more often associated with STTs (93%) than BTs (71%; P = 0.03). Gram-negative bacteria were more frequently isolated in STTs (55%) than in BTs (26%; P = 0.01) and non-prosthesis-associated infections (54%) than prosthesis-associated infections (29%; P = 0.04), whereas staphylococci were more frequently found in BTs (76%) than in STTs (52%; P = 0.03). Overall, we found gram negatives in 82% of early acute infections, 11% of chronic infections and 7% of late acute infections (P < 0.01)., Conclusion: Postoperative infections in patients after surgical resection of BTs or STTs were often polymicrobial, especially following STTs. Causative bacteria were often gram negatives in STTs and non-prosthesis-associated infections, whereas staphylococci were predominant in BTs. Based on these findings, we recommend antibiotic coverage of both gram-positive and -negative bacteria with a combination of broad-spectrum antibiotics in STTs and antistaphylococcal antibiotics as first-line therapy in infections following BT surgery.