The invention relates to an intervertebrae implant comprising two side walls (
) arranged at a distance to each other, a front wall (
) connecting the same at their one end, a back wall (
) connecting the same at their opposite other end, and one opening each on the base and cover part extending at right angles to the afore-mentioned walls. The invention also comprises at least one element (
) provided for in the space (
) enclosed by the above walls, which element has a surface pointing towards the base or cover part and can be moved back and forth between a first final position in which said surface projects at least partly outwards beyond the base or cover part and a second final position in which the surface does not project beyond the base or cover part.