Abstract: A prosthetic implant including a base portion and an additional portion which is to be securely attached to the base portion. The additional portion includes at least one post extending therefrom which is adapted to be readily received in a corresponding reverse tapered hole in the base portion. The post is adapted to be mechanically spread out to cause at least a portion of the post to become wider than the opening of the hole, thus resisting subsequent separation of the post from the hole. This secures the additional portion to the base portion of the implant. The post may be a stud-type extension integrally formed with or secured to the additional portion, or the post may be a separate member which is received in a post hole in the additional portion such that the post portion of the separate member extends from the additional portion. The post may be solid or may have a channel therethrough. The additional portion may include a substrate with a porous surface bonded or secured thereto.

Abstract: A novel cannula is disclosed for use in the application of bone cement to the prepared intramedullary canal of a bone prior to the cementation of a surgical implant therein. The novel cannula comprises a hollow tube adapted to slidingly receive the nozzle of a bone cement extruder, an inflatable cuff surrounding the tube, and means to inflate the cuff. In operation, the inflated cuff forms a seal against the wall of the intramedullary canal, thereby preventing escape of cement through the open end of the prepared canal and insuring that the applied cement is properly pressurized within the canal. As a result, a highly secure cementation of the surgical implant within the intramedullary canal is achieved.