This implant has already been tested and been approved by the FDA and is already in use routinely in total ankle replacements within the United States. We are conducting this study to gain further knowledge about the implant. In order to do this, x-rays which have been taken as part of your routine care will be reviewed. Any additional x-rays conducted during the period of the research will also be reviewed. We are also interested in measuring improvements in patient-reported information related to quality of life and pain following implantation over a 10-year period.