Abstract: Endoprosthesis for bone joint, or the like, in the form of a spherical cap having a frusto-conical opening into it; the end of the bone is shaped to matingly fit into the opening into the cap; a thrust plate passes through the bone into the cap opening to transfer thrust away from the end of the bone; grooves in the cap to promote adhesion to the bone.

Abstract: A ceramic implant having at least one component for permanently connecting resected live bone stumps without the use of bone cement or the insertion of an endoprostheses portion into the intramedullar or marrow space of the bone, the implant including at least one cylindrical sleeve having a truncated conical interior recess with rounded grooves helically formed therein for closely engaging a cooperatively formed live bond stump. The ceramic sleeve may be held to the bone stump by use of surgical screws or by a sleeve clamp, to provide a high degree of strength to the resected bone end, as compared to the natural bone strength, immediately after the implanatation operation and to reduce the cortical periphery encased by the implant to promote maximum natural bone growth with minimal inflammation and damage to the marrow space.