A coupling assembly for coupling a rod to a bone anchoring element, the set (4, 4 , 4 ") comprising coupling part (5, 5") for receiving having a first end (5a), a second end (5b) and a central axis (C) extending through the first end (5a) and the second end (5b), a channel (52) for receiving a rod (100), and a space (54) accommodation for accommodating a head (3, 3 ) of an element (1) anchor, having the accommodation space an opening (55) at the second end (5b) dimensioned to allow insertion of the head (3, 3 ) and a hole (51) extending from the accommodation space to the first end (5a), an element (6, 6, 6 ") configured to be at least partially placed in the space (54) accommodation and dimensioned so as to cover, at least partially, an inserted head (3, 3 ), an element (7, 7 ") spring, separate element (6, 6, 6") retention , Configured to be disposed at least partially in the space (54) accommodating, in which the element (7, 7 ") spring is configured to be compressed in the axial direction, wherein in an assembled state when the element (6, 6 , 6 ") retention and the spring element are arranged in the space (54) accommodating a portion of the element (7, 7") spring has such a length in the axial direction extending above the bottom of the channel portion (5, 5 ") receiving, so it can be coupled via a rod at the time of insertion.Un conjunto de acoplamiento para acoplar una varilla a un elemento de anclaje óseo, comprendiendo el conjunto (4, 4, 4") de acoplamiento una parte (5, 5") de recepción que tiene un primer extremo (5a), un segundo extremo (5b) y un eje central (C) que se extiende a través del primer extremo (5a) y del segundo extremo (5b), un canal (52) para recibir una varilla (100), y un espacio (54) de acomodación para acomodar una cabeza (3, 3) de un elemento (1) de anclaje, teniendo el espacio de acomodación una abertura (55) en el segundo extremo (5b) dimensionada de forma que permita la inserción de la cabeza (3, 3) y un orificio (51) que se extiend
