In a tibial portion of a knee joint endoprosthesis with a securing shank (10) to be inserted into the medullar cavity of the tibia, which, on one end, is provided or not with a tibia condyle terminal plate for the attachment of the articular parts of the prosthesis, the securing shank (10), in order to achieve a firm fit of the implant after the implantation, comprises a cylindrical sleeve (11) that is insertable into a cylindrical slotted drilled hole (201) of the tibia with an interior (12) accommodating the spongiosa nucleus (205) of the slotted drilled hole (201), and is fabricated from a metallic material or some other suitable, body-compatible material, while the securing shank (60) is disposed at a right angle to the terminal plate (20) extending parallelly to the horizontal or slightly inclined ostectomy area (206) (FIG. 1).

A shoulder implant for correcting a recurrent shoulder dislocation comprises a one-piece metal member at least part of which is open-celled in nature to simulate spongiosa of a bone. The use of the shoulder implant makes it possible to dispense with the removal of an implant of bone from the tibia or the pelvis which has been customary hitherto. Moreover, the intrinsic mechanical strength of the shoulder implant is responsible for a considerable reduction in the length of post-operative treatment. The open-celled nature of at least part of the shoulder implant in imitation of the spongiosa makes it possible for the bony matter of the scapula to anchor itself biologically in the implant, thus preventing the implant from coming loose.