The edge (10) is provided with a porous surface (8,11) and the under side of the endoprosthesis (1) within the edge is formed as a locating surface (13) for bone cement. The stem (5) and/or projections are provided with a porous surface (11). In the area of the locating surface (13) for the bone cement (16) at least one opening (14,15) is provided which leads from the under side of the endoprosthesis to its outside. The edge (10) supporting on the corticalis (4) projects downwards over the locating surface (13). The locating surface is smooth or has a structured or roughened surface. USE/ADVANTAGE - To provide optimal fixation of a tibia plateau endoprosthesis in the bone.
