Abstract: A prosthesis for the wrist joint and other joints which includes a carpal component having a base for cooperation with a radial component. The base is formed in the shape of a half-toroid, each end of the toroid integrally forming an intra-medullary pin for insertion into the medullary canal of the metacarpals with acrylic cement or equivalent gap-filling medium. The radial component of the prosthesis has a seat which is generally concave for receiving a side of the base of the carpal component. The seat includes a pair of adjacent concave surfaces tapering into cylindrical shafts, the toroidal base located between the shafts. A ridge is formed between the concave surfaces allowing the toroidal base to ride upon the ridge and rotate front to back and/or slide side to side. A tapered, notched stem extends from the seat for insertion into the medullary canal of the radius.