An implant for use for adjacently arranged bone plates is described, having a first bearing part, a second bearing part and a coupling element for tension-proof coupling of the first bearing part to the second bearing part. The bearing parts are curved concavely and comprise a plurality of ribs, which extend radially outwards from a central portion of the respective bearing part. The upper bearing part comprises a main body and an insert connected thereto by means of at least one connecting element. The connecting element is supported against the coupling element with regard to movement into a release position. The upper bearing part additionally has a deflectable fixing element, which is supported against the upper bearing part in the event of movement of the upper bearing part away from the lower bearing part.
