Prosthesis for cementless fixation

摘要

A joint prosthesis system is suitable for cemented fixation. The system has two metal implant components and a bearing. One of the metal implant components has an articulation surface for articulation with the bearing. The other metal implant component has a mounting surface for supporting the bearing. One of the metal implant components includes an extension, such as a stem or pegs, with an exposed outer surface. The metal implant component from which the extension extends comprises titanium and the exposed outer surface of the extension comprises a different form of titanium. A method of making the joint prosthesis is also disclosed.

主权项

1. A knee joint prosthesis comprising:
a tibial tray having a solid metal portion, a porous metal portion and a plurality of extensions, the solid metal portion having a mounting surface and the porous metal portion having a porous bone-engaging surface opposite the mounting surface; a tibial bearing having a mounting surface shaped to bear against the mounting surface of the tibial tray and an opposite articulation surface; and a femoral component having an articulation surface and an opposite bone-engaging surface; wherein: the tibial tray has a central sagittal plane, a plurality of recesses and a plurality of studs, the recesses and the studs being spaced from the central sagittal plane; each stud extends from the solid metal portion into one recess to an end located within one recess; the porous bone-engaging surface defines a transverse plane perpendicular to the central sagittal plane; the ends of the studs do not extend beyond the transverse plane of the porous bone-engaging surface of the tibial tray; each extension is mounted on one stud with a part of the extension received within one recess; and each extension extends beyond the transverse of the plane bone-engaging surface of the tibial tray to an end.