A base member of a stemless shoulder implant, the base member comprising: a circular proximal collar having a proximal surface , a bone-engaging surface opposite the proximal surface and a curved side wall extending therebetween, the proximal surface including an opening adapted to receive an articulating component of the stemless shoulder implant; and a central anchor extending distally from the bone-engaging surface of the collar distally along a longitudinal axis of the base member to a distal end ; wherein the central anchor includes a plurality of ribs , each rib projecting radially outward of the distal end of the central anchor and extending to the bone-engaging surface, each rib extending along the bone-engaging surface to a position in close proximity to or adjacent to the side wall of the collar, each rib including two lateral side walls and a rounded surface extending between the two lateral side walls, and the central anchor includes curved surfaces positioned between adjacent ribs extending from the distal end of the central anchor to the bone-engaging surface, and wherein the bone-engaging surface includes a porous metal surface, the lateral side walls include a porous metal surface, and the curved surfaces include a porous metal surface, characterized in that the base member further comprises at least one chisel slot extending from the bone-engaging surface to the proximal surface adjacent a portion of the central anchor , the at least one chisel slot configured to receive a revision tool for removing bone, and including two elongate portions and a curved portion between the two elongate portions to define a substantially "M" shaped chisel slot. a circular proximal collar having a proximal surface , a bone-engaging surface opposite the proximal surface and a curved side wall extending therebetween, the proximal surface including an opening adapted to receive an articulating component of the stemless shoulder implant; and a central anchor extending distally from the bone-engaging surface of the collar distally along a longitudinal axis of the base member to a distal end ; wherein the central anchor includes a plurality of ribs , each rib projecting radially outward of the distal end of the central anchor and extending to the bone-engaging surface, each rib extending along the bone-engaging surface to a position in close proximity to or adjacent to the side wall of the collar, each rib including two lateral side walls and a rounded surface extending between the two lateral side walls, and the central anchor includes curved surfaces positioned between adjacent ribs extending from the distal end of the central anchor to the bone-engaging surface, and wherein the bone-engaging surface includes a porous metal surface, the lateral side walls include a porous metal surface, and the curved surfaces include a porous metal surface, characterized in that the base member further comprises at least one chisel slot extending from the bone-engaging surface to the proximal surface adjacent a portion of the central anchor , the at least one chisel slot configured to receive a revision tool for removing bone, and including two elongate portions and a curved portion between the two elongate portions to define a substantially "M" shaped chisel slot. <EOS>