Femoral extension prosthetic component and tibial shelf prosthetic component for unicondylar meniscal bearing knee prosthesis and prosthesis including such a component

A unicondylar meniscal bearing for a unicompartmental knee replacement, the meniscal bearing comprising:

• a first concave bearing surface configured to bear against a femoral prosthetic component;
• a second concave bearing surface opposed to the first concave bearing surface and configured to bear against a tibial prosthetic component;
• and
• a side wall separating the first concave bearing surface from the second concave bearing surface, wherein the side wall is relatively thicker at an outer edge of the meniscal bearing and relatively thinner in a center of the meniscal bearing.

A system for a unicompartmental knee replacement comprising:

• a femoral prosthesis component attachable to a femur;
• a tibial prosthesis component attachable to a tibia and having a retaining flange projecting from a free end of a medial wall;
• and
• a meniscal bearing insertable between the femoral prosthesis component and the tibial prothesis component, the meniscal bearing component comprising:
• a first bearing surface configured to bear against the femoral prosthetic component,
• a second bearing surface opposed to the first bearing surface and configured to bear against the tibial prosthetic component, and
• a side wall separating the first bearing surface from the second bearing surface,
• wherein the side wall has a retention groove formed in a portion thereof, and wherein the meniscal bearing and the tibial prosthesis component are configured such that the retaining flange enters the retention groove on movement of the meniscal bearing relative to the tibial prosthesis component towards the medial wall.

A system for a unicompartmental knee replacement comprising:

• a femoral prosthetic component configured to be secured a femur;
• a tibial prosthesis component configured to be secured a tibia and having a retaining flange projecting from a free end of a medial wall, wherein the tibial prosthesis component has a bearing surface and an opposing bone interfacing surface, and wherein the bearing surface is convex in shape;
• and
• a meniscal bearing configured to be inserted between the femoral prosthetic component and the tibial prosthesis component, the meniscal bearing component comprising:
• a first bearing surface configured to bear against the femoral prosthetic component and having a concave shape,
• a second bearing surface opposed to the first bearing surface and configured to bear against the tibial prosthetic component and having a concave shape, and
• a side wall separating the first bearing surface from the second bearing surface,
• wherein the side wall has a retention groove formed in a portion thereof, and wherein the meniscal bearing and the tibial prosthesis component are configured such that the retaining flange enters the retention groove on movement of the meniscal bearing relative to the tibial prosthesis component towards the medial wall.