System prepares astragalus to receive the offer of ankle prosthese. The system include specific to patient cutting guide that with front surface, rear surface and at least one Cutting feature pass through guide part from front surface. Rear surface include the first protrusion or other components that be fixed to rear surface from first end to second end and be disposed sufficiently far away from the first prominent of first end. There are rear surface those of the second protrusion or other components the second protrusion that rear surface is disposed sufficiently far away from first end is fixed to from first end to second end. The first and second protrusion of tire is spaced apart and has length, in this way when patients cutting guide and the first and second bone bibliography, comprising the implantable bone of a bushing, between provide gap, rear surface and anklebone.
