Inclusion Criteria:  Patients with PJI defined according to the IDSA. Infection must be mono-microbial or multi-microbial with Staphylococcus spp sensitive to Clindamycin. Infection may be acute or chronic, nosocomial or community-acquired. Patient having received a curative treatment with Clindamycin.  Exclusion Criteria:  Patients with osteitis, osteomyelitis, septic arthritis in native joints, diabetic foot infections, spondylodiscitis, infections in external fixator, surgical site infections following neurosurgical management, bedsores, skin and soft tissue infections. Patients with mono-microbial infections other than Staphylococcus, multi-microbial infections including other bacteria than Staphylococcus, suspected Osteoarticular Infection without microbial identification. Patients with clindamycin-resistant Staphylococcal PJI, constitutive MLSb phenotype. Patients having received suspensive treatment with Clindamycin. Patients treated with Clindamycin as last line of treatment for a duration of less than 14 days. Patients refusing to participate Patients under legal protection (guardianship, curatorship, ..)