pedicle screw (1) with a threaded rod (3) and connected thereto a screw head (2) having a central longitudinal axis (8) extending in one direction, the X direction, with the following further configuration: - the screw head (2) has at its lower end facing threaded stem base head (9) which are molded away from the threaded rod (3) in X, two wall sections (10) extended in the direction Y orthogonal to the axis X laterally delimiting a cavity (13) opening with a semicircular cross section on the upper face of head (14) for receiving a connecting rod (15)； - the threaded rod penetrates the head base (9), through a bottom opening (16) connected to the cavity (13) through a joint head (39) and is housed therein so that the head screw (2) can pivot relative to the threaded rod (3) about a single axis of rotation head (18) extending parallel to the direction Y； - in the cavity (13) there is a screw (6) used for fixing the connecting rod (15) in the screw head (2), which engages with an external thread (19) into a thread inner (23) existing in the inner face of the wall sections (10)； - between the screw (6) and the head base (9) is in the hole, fastened in the screw head (2) pivoting about a pivot axis (25), a clamping device (5) extends in a direction Z orthogonal to the direction Y and X and arranged in X direction distance on the pivot head (18)； - the clamping device (5) has a recess (24) space traversed in assembled state by the connecting rod (15) and a spherical lower face (27a) oriented head base (9), whose center sphere is on the axis of rotation (25) of the clamping device； - the clamping device (5) is in installed condition loaded by the screw (6) pressed with a force directed to the head base (9), wherein the head base (9) there is an intermediate element (4) on its side facing the clamping element (5) has an interacting spherical face paired (27b) with the lower spherical face (27a) of the clamping device (5) and on the side facing the threaded rod side (3 ) ha
