Monoaxial bone screw with a shank having an external thread and, proximally and integrally adjoining this, a fork head which is thus formed rigidly with the shank , wherein the fork head is U-shaped in side view and, between the legs forming the U-shape, has a receiving opening for a correction element, in particular a correction rod, wherein there is a longitudinal direction and a radial direction , wherein the receiving opening in the fork head has a distal end adjacent to the shank and an open proximal end which faces away from this in the longitudinal direction and in which a clamping screw for the correction element can be screwed, wherein for this, the legs of the fork head have an internal thread , wherein in the region of the distal end of the receiving opening , a tool application point is formed in the form of a central depression extending in the longitudinal direction for complementarily receiving the tool, such that the screw can be turned about the longitudinal direction by means of the tool inserted in the depression and thereby screwed into the bone, wherein the legs have a radially outer peripheral region which is configured so as to be arcuate, in particular curved in the form of a circle arc, in a plane orthogonal to the longitudinal direction of the fork head and in which at least one retaining groove is formed for gripping the fork head by means of a handling instrument, characterised in that the retaining groove extends in a peripheral direction of the fork head and in a plane orthogonal to the longitudinal direction of the fork head , and the retaining groove , viewed in a theoretical section plane enclosing the longitudinal direction , starting from a surface of the peripheral region , is delimited by - a first flank portion extending radially inward and running in a plane orthogonal to the longitudinal direction of the fork head , - adjoining this, a second flank portion extending in the proximal direction and running concentrically to the longitudinal direction , - adjoining this, a third flank portion extending radially inward and running in a plane orthogonal to the longitudinal direction of the fork head , - adjoining this, a fourth flank portion extending in the distal direction and running concentrically to the longitudinal direction , which flank portion extends in the distal direction to below the first flank portion , and - adjoining this, a fifth flank portion with a component extending radially outward and running distally sloping at an angle thereto. - a first flank portion extending radially inward and running in a plane orthogonal to the longitudinal direction of the fork head , - adjoining this, a second flank portion extending in the proximal direction and running concentrically to the longitudinal direction , - adjoining this, a third flank portion extending radially inward and running in a plane orthogonal to the longitudinal direction of the fork head , - adjoining this, a fourth flank portion extending in the distal direction and running concentrically to the longitudinal direction , which flank portion extends in the distal direction to below the first flank portion , and - adjoining this, a fifth flank portion with a component extending radially outward and running distally sloping at an angle thereto. <EOS>