FULL CERAMIC KNEE JOINT PROSTHESIS HAVING POROUS REAR FACE FACING THE BONE

Abstract

The invention relates to a knee joint prosthesis comprising a femoral component (1) and a tibial component (2), each having a front face constituting the joint and a rear face (4) facing the bone, and a polyethylene (PE) liner (3). In order to allow the knee joint prosthesis to be implanted without metal and without cement, the femoral component (1) and the tibial component (2) consist of a full ceramic material and both components (1, 2) have integrated porous osseointegrative rear faces (4) facing the bone.

Claims

1. A knee joint prosthesis with a femoral component and a tibial component, each with an anterior face forming the joint and a rear face facing the bone and with a polyethylene (PE) liner, wherein the femoral component and the tibial component consist of a full ceramic and both components have an integrated porous osseointegrative rear face facing the bone.

2. The knee joint prosthesis according to claim 1, wherein the femoral component and the tibial component are each manufactured from a ceramic sintered molded article.

3. The knee joint prosthesis according to claim 2, wherein the sintered molded articles have a porous layer on their rear face.

4. The knee joint prosthesis according to claim 1, wherein the porous rear face is formed by application of a ceramic slurry and place-holders (pore-formers) in the green state and burning off of the place-holders during sintering.

5. The knee joint prosthesis according to claim 1, wherein the porous layer is created by foaming of a ceramic slurry in the green state and subsequent sintering.

6. The knee joint prosthesis according to claim 1, the porous rear face is created by joining of a dense molded article with a porous ceramic mold in the sintered state.

7. The knee joint prosthesis according to claim 6, wherein the porous mold is created by foaming of ceramic slurry and sintering or infiltration of a porous substrate material with slurry and sintering.

8. The knee joint prosthesis according to claim 6, wherein the joining is carried out by soldering or gluing.

9. The knee joint prosthesis according to claim 1, wherein the integrated porous osseointegrative rear face is created by 2c-injection molding (dense phase and porous or pore-forming phase) and sintering.

10. The knee joint prosthesis according to claim 1, wherein the porous rear face acquires an additional functionality, such as higher integration speed or antibacterial effects, through further coating.

11. The knee joint prosthesis according to claim 10, wherein the porous rear face is coated with bioglasses, hydroxylapatite, functionalized proteins, or hydrogels.

Description

[0016] FIG. 1 shows a total ceramic knee joint endoprosthesis consisting of a femoral component 1, a tibial component 2, and intermediate polyethylene (PE) liner 3 in implanted state. The porous rear face facing the bone is marked by the reference sign 4.