A joint prosthesis 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 (14) has a mounting surface for supporting the bearing. One of the metal implant components includes a solid metal portion (80F) and a porous metal portion (82F). The porous metal portion has surfaces (28F, 70F, 150F) 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 travelling through the porous metal portion into the joint space.
