Periprosthetic joint infection (PJI) is a major complication of prosthetic implantation and needs a combined surgical and antimicrobial treatment. One-stage revision results usually in similar cure rate than two-stage (around 85–92%), but antibiotic therapy duration is not well established. The aim of study was to evaluate the efficacy of a short six-weeks antibiotic course in hip and knee PJIs after one-stage replacement arthroplasty (RA). This was a retrospective, observational study conducted at Orthopaedic Department of Cochin Hospital, Paris, between 1stJanuary 2010 and 31 December 2015. Inclusion criteria were: age>18 years; clinical/microbiological diagnosis of PJI; one-stage RA; 6-weeks course of antibiotics; follow-up of at least one year. PJIs were classified depending on the delay of infection from implantation as: early(<3 months), delayed(3–24 months), late(>24 months). Pearson's-χ2 and Aim
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