Bone anchoring device

A bone anchoring device comprising:

• an anchoring element having a shank for anchoring in bone and a head;
• a receiving part having a central axis defining a coaxial passage configured to pivotably receive the head of the anchoring element, such that the shank can assume a plurality of angular positions relative to the receiving part;
• and
• a pressure member movable in the passage to exert pressure on the head to clamp the head in the receiving part;
• wherein the head comprises a first position indication structure configured to engage a second position indication structure of the pressure member when the shank assumes a first angular position from among the plurality of angular positions relative to the receiving part, and wherein the first and second position indication structures are configured to be disengaged from one another when the shank is at an angular position different from the first angular position relative to the receiving part;
• wherein the first position indication structure is formed on an outer surface of the head without forming a groove on the outer surface.

A bone anchoring device comprising:

• an anchoring element having a shank for anchoring in bone and a head;
• a receiving part having a central axis defining a coaxial passage configured to pivotably receive the head of the anchoring element, such that the shank can assume a plurality of angular positions relative to the receiving part;
• and
• a pressure member movable in the passage to exert pressure on the head to clamp the head in the receiving part, the pressure member defining a spherical segment-shaped head receiving recess for pivotably holding the head therein;
• wherein the head comprises a first position indication structure configured to engage a second position indication structure of the pressure member when the shank assumes a first angular position from among the plurality of angular positions relative to the receiving part, and wherein the first and second position indication structures are configured to be disengaged from one another when the shank is at an angular position different from the first angular position relative to the receiving part;
• wherein the second position indication structure is engageable with the first position indication structure without protruding into a profile defined by the spherical segment-shaped head receiving recess.