The connecting element (1) has the shape of a rod with longitudinal axis (2), a rear end (6), and a front end (7), and serves to span a number of bone anchoring elements (12) implanted in the bone. The connecting element (1) comprises at least one longitudinal slot (5). This provides it with a greater elasticity during implantation so that it can be reversibly deformed. The connecting element can then be stiffened once it has been fixed in the bone anchoring elements (e.g. pedicle screws).