Prosthesis with surfaces having different textures and method of making the prosthesis

Abstract

A joint prosthesis system is suitable for cementless fixation. The system includes a metal implant component that has a mounting surface for supporting an insert. The metal implant component includes a solid metal portion and a porous metal portion. The porous metal portion has surfaces with different characteristics, such as roughness, to improve bone fixation, ease removal of the implant component in a revision surgery, reduce soft tissue irritation, improve the strength of a sintered bond between the solid and porous metal portions, or reduce or eliminate the possibility of blood traveling through the porous metal portion into the joint space. A method of making the joint prosthesis is also disclosed. The invention may also be applied to discrete porous metal implant components, such as augment.

1 . An orthopaedic prosthetic component, comprising:
 a polymer modular tibial bearing component, and   a tibial tray component configured to be implanted into a proximal end of a patient's tibia and assembled with the modular tibial bearing intraoperatively, the tibial tray component comprising:
 a proximal-facing surface configured to receive the modular tibial bearing component, 
 a distal-facing surface positioned opposite the proximal-facing surface, 
 an outer wall extending between the distal-facing surface and the proximal-facing surface, 
 a solid metal portion including the proximal-facing surface and a proximal section of the outer wall, and 
 a single, integral metal portion including (i) a porous base including a distal-facing surface and a distal section of the outer wall, (ii) a central stem extending distally from the distal-facing surface of the porous base, and (iii) a plurality of pegs extending distally from the distal-facing surface of the porous base. 
   
     
     
         2 . The orthopaedic prosthetic component of  claim 1 , wherein each peg extends to a free distal end, the free distal end having a smooth outer surface.