ENDOPROSTHESIS WITH CONVEX CONFIGURATION
The invention relates to an endoprosthesis for replacement of a joint, in which slide surfaces that have different contours and correspondingly define movement planes for bearing are formed by an intermediate part. According to the invention, the intermediate part has a projection, preferably a convex projection, on at least one side face, in order to avoid fibrosis.
1 . An endoprosthesis for replacement of a joint, comprising a component configured to be connected to an upper bone and which has a bottom slide surface, a component configured to be connected to a lower bone and which has a top slide surface, and an intermediate part which, on its bottom and top, has in each case a slide surface which, together with the slide surfaces of the components, in each case define a movement plane for a bearing, wherein the intermediate part is self-supporting and has a projection on at least one side face.
2 . The endoprosthesis according to claim 1 , wherein the projection is a convex bulge.
3 . The endoprosthesis according to claim 1 or 2 , wherein the projection extends across the entire length of the respective outer face.
4 . The endoprosthesis according to claim 1 or 2 , wherein the projection is formed on a medial longitudinal face of the intermediate part.
5 . The endoprosthesis according to claim 1 or 2 , wherein the projection has an arc-shaped contour in plan view.
6 . The endoprosthesis according to claim 5 , wherein the arc-shaped contour follows an arc of a circle whose centre is offset towards the opposite side of the intermediate part.
7 . The endoprosthesis according to claim 1 or 2 , wherein additional projections are formed on an anterior face and a posterior face of the intermediate part.
8 . The endoprosthesis according claim 1 or 2 , wherein the intermediate part is made of plastic.
9 . The endoprosthesis according to claim 1 or 2 , wherein the projections are formed in one piece with the intermediate part.
10 . The endoprosthesis according to claim 1 or 2 , wherein the projections are formed separately from the intermediate part and are secured thereon.
11 . The endoprosthesis according to claim 1 or 2 , wherein the projections are covered with a protective layer.
12 . The endoprosthesis according to claim 11 , wherein the protective layer is designed as a cap or partial collar.
13 . The endoprosthesis according to claim 11 , wherein the protective layer is secured mechanically on the projections.
14 . The endoprosthesis according to claim 11 , wherein the protective layer is secured chemically on the projections.
15 . The endoprosthesis according to claim 1 , wherein the slide surfaces of the intermediate part have different contours.