Ankle arthroplasty system and methods

A system for preparing a bone for joint arthroplasty, the system comprising:

• a burr comprising a cutting element that rotates about an axis of rotation;
• and
• a patient-specific mounting plate comprising a contoured surface that is shaped to match a contour of the bone at which the patient-specific mounting plate is to be attached to the bone;
• a guide mechanism configured to enable relative motion between the axis of rotation and the patient-specific mounting plate to facilitate formation of a prepared surface on the bone with the cutting element;
• and
• a talar arthroplasty implant;
• wherein:
• the bone comprises a talus comprising a talar dome;
• and
• the guide mechanism is further configured to guide motion of the axis of rotation to resect the talar dome to define the prepared surface such that the prepared surface is shaped to receive the talar arthroplasty implant.

A system for preparing a talus for joint arthroplasty, the talus comprising a talar dome, the system comprising:

• a cutting element;
• a patient-specific mounting plate comprising a contoured surface that is shaped to match a contour of the talus, anterior to the talar dome, at which the patient-specific mounting plate is to be attached to the talus;
• and
• a guide mechanism configured to guide motion of the cutting element relative to the patient-specific mounting plate to facilitate resection of the talar dome to form a prepared surface on the talus such that the prepared surface is shaped to receive a talar arthroplasty implant.