The total knee replacement has become a routine procedure. Survival rate of over 90% after 10 years are generally reported. However, complications and reoperation may still occur for many reasons, and some of them may be related to component design: loosening (tibial above), polyethylene wear, knee stiffness, ligamentous instability, etc ... . Therefore, new designs can, at least in theory, improve the results of conventional models.

In this study, the investigators want to compare retrospectively data concerning survival rates of patients wearing total knee prosthesis with mobile plate for over 10 years, with the ones published in the literature for conventional fixed-bearing prostheses.

Inclusion Criteria:

• Patients over 18 years
• Patients wearing total knee prosthesis with mobile plate for over 10 years

Exclusion Criteria:

• Patients under 18 years

Patients wearing total knee prosthesis with mobile plate for over 10 years