The invention relates to a plate-implant for use in osteosynthesis, comprising at least one first plate component with throughbores for receiving fastening screws and a connection means, at least one second plate component with throughbores for receiving fastening screws and a receiving means for receiving a connection means. According to the invention, each plate component is slidable in one direction relative to the other plate component, the plate components being provided with a device limiting their slide path relative to each other. The device comprises a clamping screw (18) having a thread and a screw head and, in the mounted state of the two plate components (2, 3), the thread cooperates with the connection means (5) and the screw head with a longitudinal borehole (14) provided in the second plate component (3) in such a way that a clamping effect is obtained between the screw head and the longitudinal borehole (14) and between the connection means (5) and the receiving means (6).