The hip or knee is a validated treatment of end-stage osteoarthritis, and these interventions commonly make a significant improvement in the quality of life of patients. Infection can occur in 1-5% of cases. Diagnosis is often difficult, but the knowledge of infected or not infected character directly influences the surgical conduct. It is therefore recommended that the positive or negative diagnosis is made in the most reliable way possible, but no single element only allows a low diagnosis. The concomitant use of several clinical, radiological and aggregated into a composite score history could help facilitate this preoperative approach during reoperation on prosthetic joint

Inclusion Criteria:

• Patients over 18 years
• Patients operated in the service in 2014 to care for end-stage hip or knee osteoarthritis by implantation of a total hip or knee prosthesis.

Exclusion Criteria:

• Patients under 18 years

Patients operated in the service in 2014 to care for end-stage hip or knee osteoarthritis by implantation of a total hip or knee prosthesis.