Abstract: An endoprosthetic device for a prosthesis between metatarsal and phalangeal bones comprising proximal and distal components which are engageable with each other. The proximal component has a convex, part-spherical bearing surface and a stem projecting from this surface for securing the proximal component into the end of the first metatarsal. The distal component has a concave, part-spherical bearing surface and a stem projecting from this surface for securing the distal component into the end of the phalanx adjacent to the first metatarsal. The engagement of the two components forms a less-than-hemispherical articulation.

Abstract: A hip joint prosthesis consisting of an artificial femur head and an artificial acetabular socket. The femur head includes a ball head which is received in the acetabular socket, a neck connecting the ball head to a platform and an arcuate stem which is T-shaped in cross section and extends from the platform for insertion into the medullar cavity in a femur. A recess located on the lateral portion of the platform and several steps located along the medial portion of the stem are further provided to securely anchor the prosthesis when it is cemented into the medullar cavity.

Abstract: An implantable prosthetic joint comprising a first member and a second member, both of which include a stem portion implantable in bone. The first member has a neck portion and a protuberant head portion attached to the neck portion. The second member has a head-receiving cavity and a slot in communication with the cavity to provide hinge-like motion of the joint as the neck portion is moved within the slot and the head portion rotated within the cavity. The head-receiving portion of the second member includes a transverse channel communicating with the cavity and a transverse slot communicating with the transverse channel whereby the head and neck portion of the first member may be inserted into the head-receiving portion of the second member in a direction transverse to the plane established by the hinge-like motion of the first member relative to the second member as the neck portion of the first member moves along the channel in the head-receiving portion of the second member.