Anchoring member suitable for use in a polyaxial bone anchoring device and polyaxial bone anchoring device with an enlarged pivot angle to one side

A method for coupling a rod to a bone via a polyaxial bone anchoring device comprising a receiving part, a locking element, and an anchoring member configured to be pivotably connected to the receiving part, the anchoring member comprising a bone anchoring section having a first end, a second end, and a bone engagement structure on at least a portion thereof, a head, wherein a central axis extends through respective centers of the head and the first and second ends of the bone anchoring section, and a neck between the bone anchoring section and the head, the neck having an outer surface that is asymmetric with respect to the central axis, wherein a first cross-section of the neck that is perpendicular to the central axis includes a portion of the neck where the outer surface of the neck is at a minimum distance from the central axis, the minimum distance being oriented in a first radial direction perpendicular to the central axis, wherein for a first portion of the neck located between the head and the first cross-section, a distance between the central axis and the outer surface in the first radial direction decreases as the neck extends along the central axis towards the first cross-section, while a distance between the central axis and the outer surface in a radial direction that is different from the first radial direction stays the same or increases as the neck extends along the central axis towards the first cross-section, the method comprising:

• inserting the anchoring member into a bone;
• adjusting an angular position of the receiving part relative to the anchoring member;
• inserting a rod into a channel of the receiving part;
• and
• advancing the locking element in the receiving part to lock the angular position of the anchoring member and a position of the rod relative to the receiving part.