The prosthesis (1) has a talus implant (2) destined to be implanted in or on a talus, and a tibial implant (4) implanted in or on a tibia. An intermediate implant (6) is interposed between the tibial implant and talus implant. The intermediate implant is mounted relative to the talus implant at the level of contact interface in order to allow the movement of the prosthesis. A configurable coupling unit (10) arranges the intermediate implant with respect to the tibial implant according to a specific configuration i.e. neutral configuration, chosen from a set of possible configurations. Independent claims are also included for the following: (1) a method for fabricating an ankle prosthesis (2) a test ankle prosthesis to be implanted in a location of ankle prosthesis, comprising a test talus implant (3) a surgical kit, comprising ankle prosthesis and test ankle prosthesis.
