Abstract: This hook serves to treat vertebral column deformities. It is comprised of a shaft portion (2) with a longitudinal axis (1) to which a longitudinal support rod (5) can be attached transversely to the longitudinal axis (1), as well as a hook body (3) with a convex posterior side (34) and a concave anterior side (35) bent away from the longitudinal axis (1) connecting to the shaft portion (2). It is provided with a penetrating drill hole (36) extending from the convex posterior side (34) to the concave anterior side (35), to accept a screw (4).