The frequency of arthroplasty among older people is increasing. Taking care of Prosthetic Joint infection (PJI) in this specific population is a challenge. The purpose of this multicentric retrospective study was to evaluate the bacterial epidemiology of hip and knee PJI in octogenarians and nonagenarians over ten years. Data were collected using two softwares* in each of the 4 Centers participating. Inclusion criteria: age ≥ 80 years PJI (knee or hip) between January 2007 and December 2016 microbiological data available (strains isolated from osteo-articular samples) Bacterial identification: biochemical methods, followed by Malditof since 2009. For Staphylococcus aureus, Pseudomonas aeruginosa and Enterobacteriaceae, resistance profiles to antibiotics frequently used in PJI were collected. Antimicrobial susceptibility testing: disk diffusion (recommendations: French Society of Microbiology yearly updated).Aim
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