Abstract: Prosthetic ankle replacements, prostheses, and associated methods of implanting prosthetic ankle and other joint replacements. In one form, a tibia stem has a geometry to facilitate implant installation while providing means to transfer load over a larger surface area through a “press-fit,” “scratch-fit” or “cortical fit”, thus lowering the contact stresses at the tibia-metal implant interface. The design and its implantation procedure also address minimization of misalignment. A talus element presents a partial-hemispherical surface; a tibial element which is to be affixed within the tibia, having an elongated stem part which extends into and within a canal of the tibial inner cortex, an intermediate body part which smoothly widens in radius toward an end which is a base to the tibial element, the base having a concavity formed therein shaped to match the partial-hemispherical surface of the talus element with a plastic cap between the two.