Inclusion Criteria:  Patient implanted with the studied device according to the instructions for use, for primary surgery in patients with ankle joints damaged by severe rheumatoid, post-traumatic or degenerative arthritis Adult patient (≥18 years old) Patient who received an information form and is willing to participate in the study  Exclusion Criteria:  Contraindications listed in the instructions for use Patient who is not able to express his/her non opposition