A dynamic bone anchor is provided comprisinga longitudinal core member (2, 2, 2", 2") having a first end (21) and a second end (22) and a longitudinal axis (L) extending through the first end and the second endat least one tubular segment (3, 3, 3") provided on the core member, the tubular segment having an outer bone engagement structure (31)wherein in a first configuration the at least one tubular segment is movable on the core member along the longitudinal axis andwherein in an optional second configuration, the at least one tubular segment is fixed relative to the core member. Two ore more tubular segments may be provided.
