A bone anchoring assembly for dynamic stabilization is provided. The bone anchoring assembly includes a bone anchoring element having a head and a shank to be anchored in a bone or a vertebra, a receiving part for receiving a rod, a pressure element and a monolithic locking element. The rod (8) includes a flexible section which is made at least partly of a polymer material. The receiving part comprises a first channel with an approximately U-shaped cross-section with two free legs. Furthermore, the locking element directly cooperates with the legs to simultaneously secure the rod in the first channel (58) and exert a pressure on the pressure element that exerts pressure onto the head of the bone anchoring element to lock the angular position of the bone anchoring element relative to the receiving part. A first pin-shaped projection is provided at the locking element which comes into contact with the flexible section of the rod when tightening the locking element.
