Orthopaedic implant with proximal collar

A prosthetic component implantable into a hollow interior portion of a first bone, said prosthetic component comprising:

• a proximal body having a lateral side;
• a stem disposed on a lower portion of the proximal body and extending therefrom in a distal direction, said stem having a longitudinal axis, wherein an average width of the proximal body in a medial-lateral dimension is wider than the stem;
• and
• a collar disposed on an upper portion of the proximal body and extending outward therefrom in a medial direction and in a posterior direction and in an anterior direction to thereby form a tri-directional, continuous medial-posterior-anterior overhang, said collar being characterized by an absence of any lateral overhang and wherein the posterior and anterior portions of said overhang each terminate in the lateral direction at a terminal posterior point and a terminal anterior point, respectively, along posterior and anterior sides of the proximal body, respectively, to thereby define a spacial posterior gap and a spacial anterior gap between the lateral side of the proximal body and said terminal posterior point and terminal anterior point, respectively.

A prosthetic component implantable into a hollow interior portion of a first bone, said prosthetic component comprising:

• a proximal body having a lateral side and a plurality of circumferential terraces;
• a stem disposed on a lower portion of the proximal body and extending therefrom in a distal direction, said stem having a longitudinal axis and a slot extending along said longitudinal axis, wherein an average width of the proximal body in a medial-lateral dimension is wider than the stem, and said stem terminates in a substantially pointed end;
• and
• a collar disposed on an upper portion of the proximal body and extending outward therefrom in a medial direction and in a posterior direction and in an anterior direction to thereby form a tri-directional, continuous medial-posterior-anterior overhang, said collar being characterized by an absence of any lateral overhang;
• wherein a majority length of the stem defines a common, non-varying radius.

A prosthetic component implantable into a hollow interior portion of a first bone, said prosthetic component comprising:

• a proximal body;
• a stem disposed on a lower portion of the proximal body and extending therefrom in a distal direction, said stem having a longitudinal axis, wherein a distal-most portion of the proximal body is wider than a proximal-most portion of the stem such that the stem and the proximal body cooperatively form a convex corner therebetween, said male corner defining a boundary between said distal-most portion of the proximal body and said proximal-most portion of the stem;
• a collar disposed on the proximal body and extending outward therefrom in a sideways direction with respect to the longitudinal axis of the stem to thereby define a ledge;
• wherein the ledge and the proximal body form an abrupt concave corner therebetween;
• wherein the male corner comprises an abrupt transition between the stem and the proximal body that is sufficiently abrupt in dimension and configuration to stimulate bone ingrowth, to a greater degree than bone ingrowth occurring about the stem, when implanted within the hollow interior portion of the first bone;
• wherein the distal-most portion of the proximal body is wider in a medial-lateral dimension than the stem in said medial-lateral dimension;
• wherein the convex corner comprises a circumferential male corner;
• wherein the circumferential convex corner defines a circle;
• wherein the distal-most portion of the proximal body is at least two millimeters wider than the proximal-most portion of the stem;
• wherein the collar, proximal body and stem cooperatively define a first collective length, and wherein the convex corner is spaced apart from a proximal-most portion of the collar by a distance of at least one-fourth of said first collective length;
• wherein the stem tapers inwardly from the convex corner in a proximal-to-distal direction to thereby define a concave area;
• wherein the tapering of the stem further comprises a circumferential, radial inward tapering to thereby define a circumferential concave area;
• wherein the collar extends outward from the proximal body in a medial direction and in a posterior direction and in an anterior direction such that the ledge comprises a tri-directional, continuous medial-posterior-anterior overhang;
• wherein the overhang has a flared, non-planer undersurface, and wherein the proximal body has a flared exterior surface defining a non-cylindrical, flared shape such that said proximal body and the flared, non-planer undersurface of the overhang cooperatively define a doubleflared contact surface to thereby enable subsidable engagement of said double-flared contact surface at two different rates of subsidence;
• wherein the flared exterior surface of the proximal body defines at least a majority of a frustoconical shape;
• wherein the collar is characterized by an absence of any lateral overhang and wherein the posterior and anterior portions of said overhang each terminate in the lateral direction at a terminal posterior point and a terminal anterior point, respectively, along posterior and anterior sides of the proximal body, respectively, to thereby define a spacial posterior gap and a spacial anterior gap between the lateral side of the proximal body and said terminal posterior point and terminal anterior point, respectively;
• wherein a majority length of the stem defines a common, non-varying radius.