Tibial prosthesis

A tibial prosthetic knee component comprising:

• a) a tibial tray for replacing a portion of the patient's proximal tibia;
• b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia;
• c) the stem including means for attachment to the tray;
• d) the stem comprising a generally cylindrically shaped proximal portion and a conically shaped distal portion;
• e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem;
• f) wherein the fins have tips that are sharp at the distal portion of the stem to cut the bone, wherein the fin tips become less sharp proximally;
• and
• g) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.

A tibial prosthetic knee component comprising:

• a) a tibial tray for replacing a portion of the patient's proximal tibia;
• b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia;
• c) the stem including gradually tapering distal section and a generally cylindrically shaped section;
• d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem;
• e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3 to 180.degree. (3-180 degrees);
• f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm;
• and
• g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion.

A tibial prosthetic knee component comprising:

• a) a tibial tray for replacing a portion of the patient's proximal tibia;
• b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia;
• c) the stem comprising a generally cylindrically shaped proximal portion and a gradually tapering distal portion;
• d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem;
• e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3.degree. to 180.degree. (3-180 degrees);
• f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm;
• and
• g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion.

A tibial prosthetic knee component comprising:

• a) a tibial tray for replacing a portion of the patient's proximal tibia;
• b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia;
• c) the stem including gradually tapering distal section and a generally cylindrically shaped section;
• d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem;
• e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3.degree. to 180.degree. (3-180 degrees);
• f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm;
• g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion;
• h) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.

A tibial prosthetic knee component comprising:

• a) a tibial tray for replacing a portion of the patient's proximal tibia;
• b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia;
• c) the stem comprising a generally cylindrically shaped proximal portion and a gradually tapering distal portion;
• d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem;
• e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3.degree. to 180.degree. (3-180 degrees);
• f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm;
• g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion;
• h) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.

A tibial prosthetic knee component comprising:

• a) a tibial tray for replacing a portion of the patient's proximal tibia;
• b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray forming an angle therewith, for anchoring the tibial tray to the patient's proximal tibia;
• c) the stem being removably attached to the tray;
• d) the stem including a generally cylindrically-shaped proximal section and a tapered distal section with a pointed distal tip;
• e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem, the fins communicating with the distal tip;
• f) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal section;
• and
• g) wherein the fins have edges that vary in sharpness between the ends of the stem.

A tibial prosthetic knee component comprising:

• a) a tibial tray for replacing a portion of the patient's proximal tibia;
• b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia;
• c) the stem including means for attachment to the tray;
• d) the stem comprising a generally cylindrically shaped proximal portion and a conically shaped distal portion;
• e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem;
• and
• f) wherein the fins have tips that are sharp at the distal portion of the stem to cut the bone, wherein the fin tips become less sharp proximally.