Femoral stem with partially recessed porous coating

A femoral stem prosthesis, comprising:

• a prosthesis body having a neck and a stem body generally opposite the neck;
• a porous coating receiving area formed from the prosthesis body and configured to at least partially selectively receive and retain a porous coating thereon;
• a medially arcuate section of the porous coating adjacent a medially vertical section of the stem body;
• a smooth medial transition between the medially arcuate section of the porous coating and the medially vertical section of the stem body, the smooth medial transition comprising at least one recess formed in the porous coating receiving area extending inwardly by a depth relative to the stem body such that applying the porous coating over the porous coating receiving area by a thickness approximately equal to the depth of the recess results in the porous coating along the medially arcuate section being substantially flush with the medially vertical section of the stem body;
• and
• a collar of the porous coating outwardly extending relative to the stem body by approximately the thickness along a portion of the porous coating receiving area adjacent to and approximately flush with the stem body, wherein the femoral prosthesis has a size and shape for proximal press-fit engagement with a bone cavity substantially along the collar, but not along the smooth medial transition between the medially arcuate section of the porous coating and the medially vertical section of the stem body.

A femoral stem prosthesis, comprising:

• a prosthesis body having a neck extending from one side thereof and a stem extending from another side thereof generally opposite the neck and terminating at a distal tip;
• a porous coating receiving area formed from the prosthesis body;
• a medial step along a medial arc of the prosthesis body defining a medial transition wherein the stem projects out and away from the porous coating receiving area;
• a lateral step along a lateral arc of the prosthesis body opposite the medial arc and defining a lateral transition wherein the stem projects out and away from the porous coating receiving area;
• and
• a porous coating selectively applied to the porous coating receiving area in an amount so the porous coating is flush with the stem along the medial arc and the lateral arc and extends outwardly along an anterior and a posterior sides of the femoral stem prosthesis, wherein the medial arc and the lateral arc of the femoral stem prosthesis slide in uninterrupted relation over an open rim of a bone cavity during implantation while the femoral stem prosthesis is of a size and shape for proximal press-fit engagement within the bone cavity along the anterior and the posterior sides with the porous coating.