Outcome of Old Patient With Articular With Articular Implant Infection

Articular Implant Infection (AII) is itself a complicated diagnosis (diagnosis confirmation, pathogen identification, with appropriate samples) and a challenging condition to treat (long antibiotic exposure, repeated surgery, complex implant change). This condition requires a good cooperation between surgeon and infectious disease specialist, with a comprehension of each one's constraint. In elderly patients, the application of existing recommendations is impeded by multiple frailties (malnutrition, loss of autonomy, polypathology) which make each decision crucial. Indeed, from the choice of surgery to antibiotics management, all medical decision can induce more adverse events than in younger patients. For a better knowledge of the long-term consequences of AII in elderly patient, the investigators conduct a prospective, multicentric study, based on the evaluation of the EQ-5D-5L score during one year after AAI diagnosis in patients older than 75. The investigators evaluate this score and compare different groups of patients, according to age, nutrition status, Charlson comorbidity index, hospital stay length, and loss of autonomy, among others. The aim of this study is to better evaluate the burden of AII on elderly patients, in terms of quality of life. Secondly, the investigators would like to identify the factors that influence the prognosis, in order to guide further prospective research.