An implantation system for a locking nail has an aiming device, wherein the locking nail is formed for detachable attachment to the aiming device at the one end thereof. The nail has two locking holes on the other end and has an exterior feature such as a groove connecting the locking holes which groove is parallel to the axis, or indentations or elevations running in the perimeter direction in the region of the locking holes. The aiming device has a rigid aiming arm with a free end portion having three aiming bores arranged in a plane generally parallel to the axis. The outer two of the aiming bores are located at a distance from each other which corresponds to the distance of the distal locking holes of the locking nail. The system further has a connecting piece universally movable on the aiming arm. The connecting piece has an accommodation aperture for selective detachable attachment to a rod-like nail adapter which, on its part, has a coupling for detachable attachment of the locking nail.