A bone anchoring assembly for dynamic stabilization is provided, comprising a bone anchoring element (2) having a head (4) and a shank (3) to be anchored in a bone or a vertebra, and a receiving part (5) for receiving a rod (8), the rod (8) having a flexible section which is made at least partly of a polymer material. The receiving part (5) comprises a first channel (58) with an approximately U-shaped cross-section with two free legs (52, 53). Furthermore, a locking element (7) is provided directly cooperating with the legs (52, 53) to secure the rod (8) in the first channel (58), wherein a first pin-shaped projection (73) is provided at the locking element (7) which comes into contact with the flexible section of the rod (8) when tightening the locking element (7) in such a way that in the tightened state the integral structure of the rod (8) is not violated.本案提供一種動態穩定用之骨骼固定總成,包括骨骼固定元件(2),有頭部(4),和要固定於骨骼或椎骨之軸部(3),以及容納桿件(8)用之容納件(5),桿件(8)有撓性段,至少部份係由塑膠材料製成。容納件(5)包括大致為U形斷面之第一槽溝(58),有二自由股部(52,53)。此外,設有鎖定元件(7),直接與股部(52,53)合作,把桿件(8)保固於第一槽溝(58)內,其中在鎖定元件(7)設有第一插銷狀凸部(73),當旋緊鎖定元件(7)時,會與桿件(8)之撓性段接觸,其方式為在旋緊狀態時,不致有損桿件(8)之整體結構。3‧‧‧軸部5‧‧‧容納件7‧‧‧鎖定元件8‧‧‧桿件9‧‧‧管狀延長部52,53‧‧‧自由股部55‧‧‧容納件第一端56‧‧‧容納件第二端68‧‧‧槽溝71‧‧‧陽螺紋73‧‧‧插銷
