A rod-shaped implant for stabilizing bone structures, in particular the spinal column is provided, the rod-shaped implant (2, 2, 2"), comprising a rod member (20) having a first end (2a) and a second (2b) and a longitudinal axis, the rod-member being at least partly made from a plastic material exhibiting flexibility, a longitudinal bore (21) provided in the rod-member and a reinforcing rod-member (22, 22, 22") accommodated in the bore (21) which is made from a material which is more rigid than the material of the rod-member itself, wherein the reinforcing rod-member is slidable in the bore,
