The purpose of the study is to evaluate the concentrations of antibiotics used as empirical treatment in serum and periprosthetic tissues during reimplantation of infected hip and knee prostheses

The purpose of the study is to evaluate the concentrations of antibiotics (daptomycin, vancomycin, cefotaxime, ceftriaxone, cefepime) in serum and periprosthetic tissues(bone and synovial joint) used as empirical treatment during reimplantation of infected hip and knee prostheses (1-stage or 2-stage management).

Inclusion Criteria:

• Adult patients (aged of 18 years or more) who undergo reimplantation surgery for infected hip or knee prosthesis (performed in 1 or 2-stage(s)), and for whom referral physicians plans to use an empirical antibiotic therapy including cefotaxime, ceftriaxone, cefepime, daptomycin, or vancomycin.

Exclusion Criteria:

• Patients with multiple prosthetic joint infections, or with curative antibiotic therapy ongoing within two weeks or less prior to surgery, or for whom an antibiotic prophylaxis is decided by referral for the reimplantation surgery, or for whom an antibiotic-loaded cement containing the same antibiotic chosen for empirical therapy after reimplantation was used in case of 2-stage exchange

Adult patients with hip and knee prostheses infections