Cementless tibial implant
First Claim
Patent Images
1. A knee prosthesis comprising:
- a monoblock tibial component having a tibial tray and a stem extending downwardly from an inferior surface of the tibial tray; and
a plurality of steps formed in the stem;
wherein at least two of the plurality of steps each comprises a first lobe portion, positioned closer to a posterior side of the stem than an anterior side of the stem, and a first pair of concave portions;
wherein each of the first lobe portions is interposed between the first pair of concave portions on the same step.
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Accused Products
Abstract
A cementless orthopedic implant is disclosed. More specifically, but not necessarily entirely, a cementless tibial implant used as a component of a knee joint is disclosed. The tibial component may comprise a tibial tray and stem. The tibial component may be a monoblock design used for both primary and revision surgeries. The stem of the tibial component may comprise a plurality of protruding steps that assist in providing primary fixation and stability without the use of screws or cement. The stem of the tibial component may further comprise a first and second stepped wing portions.
36 Citations
32 Claims
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1. A knee prosthesis comprising:
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a monoblock tibial component having a tibial tray and a stem extending downwardly from an inferior surface of the tibial tray; and a plurality of steps formed in the stem; wherein at least two of the plurality of steps each comprises a first lobe portion, positioned closer to a posterior side of the stem than an anterior side of the stem, and a first pair of concave portions; wherein each of the first lobe portions is interposed between the first pair of concave portions on the same step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A knee prosthesis comprising:
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a stemless tibial bearing insert having an inferior surface and a superior surface; a monoblock tibial component having a tibial tray and a stem; the tibial tray having a superior surface and an inferior surface; the stem extending downwardly from the inferior surface of the tibial tray; and a plurality of steps formed in the stem; wherein the superior surface of the tibial tray is configured and adapted to matingly engage the inferior surface of the stemless tibial bearing insert; wherein the superior surface of the tibial tray is devoid of a stem cavity; and wherein the stem comprises a first stepped wing portion positioned closer to a posterior side of the stem than an anterior side of the stem. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A knee prosthesis comprising:
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a monoblock tibial component having a tibial tray and a stem extending downwardly from an inferior surface of the tibial tray; the stem comprising a first wing portion extending outwardly therefrom and positioned closer to a posterior side of the stem than an anterior side of the stem; and a plurality of steps formed in the first wing portion. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A knee prosthesis comprising:
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a stemless tibial bearing insert having a superior surface and an inferior surface; a tibial component having a tibial tray comprising a superior surface and an inferior surface, a medial side, and a lateral side; the tibial component further comprising a tibial stem; wherein the tibial tray and the tibial stem are of unitary construction; and a plurality of steps formed in the tibial stem; wherein each of the steps comprises a first lobe portion and a second lobe portion, wherein each of the first lobe portion and the second lobe portion are positioned closer to a posterior side of the stem than an anterior side of the stem; wherein each of the steps further comprises a first pair of concave portions and a second pair of concave portions; wherein the first lobe portion of each step is disposed between the first pair of concave portions on the same step; wherein the second lobe portion of each step is disposed between the second pair of concave portions on the same step; wherein the first lobe portions of the plurality of steps define a medial stem wing; wherein the second lobe portions of the plurality of steps define a lateral stem wing; wherein the superior surface of the tibial tray is substantially planar and devoid of a stem cavity; wherein the tibial stem is formed in a unitary manner with respect to the tibial tray; wherein the tibial stem extends in a distal direction from the inferior surface of the tibial tray; wherein the tibial implant further comprises a total length that is measured from a proximal end of the tibial tray and a distal end of the tibial stem; wherein the tibial stem comprises a stem length that is measured from the inferior surface of the tibial tray to the distal end of the tibial stem; wherein a ratio between the total length of the tibial implant to the stem length of the tibial stem is between a range of about 1;
0.75 to about 1;
0.95;wherein the tibial tray comprises a tray width defined as a length between its medial side and its lateral side; wherein each of the plurality of steps comprises a step width defined as a distance that is less than, and formed between, the medial side and the lateral side of the tibial tray; wherein a ratio between the tray width and the step widths is between a range of about 1;
0.2 and about 1;
0.75;wherein each of the plurality of steps comprises a thickness defined as a distance in a proximal to distal direction; wherein the tibial tray comprises a sidewall that defines a perimeter of the superior surface, wherein the sidewall comprises a height; wherein a ratio between the thickness of at least one of the plurality of steps to the height of the sidewall of the tibial tray is between a range of about 0.5;
1 to about 1;
1.
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Specification