One of the challenges faced during total ankle replacement (TAR) surgery involving the successful implantation of a mobile bearing prostheses has been the necessity to perform aggressive and precise bone resection. While the first generation, fixed bearing prostheses were adequate in many respects, they did not allow complete axial rotation of the ankle. This shortcoming is avoided by implanting a three-part system in which an articulating polyethylene bearing is inserted between the two tibial and talar components of the prostheses. Mobile bearing TAR outcomes have tended to be unpredictable however, with the probability of success often determined solely by the skill of the surgeon. The MOBILTY Total Ankle System significantly advances the mobile bearing concept by allowing surgery to be performed under conditions that require only minimal bone resection, leading to a significantly and consistently higher percentage of successful outcomes.