A bone anchor includes: a main body defining a longitudinal axis and including a head at least one insertion hole which extends from a first opening formed in the head to a second opening formed in the main body, the at least one insertion hole having an axis which is arranged to be inclined with respect to the longitudinal axis of the main body at an angle, and the insertion hole being configured to receive and guide therethrough a pin-shaped element to be anchored within a bone or bone fragment and a locking device configured to lock the position of the pin-shaped element inserted within the at least one insertion hole in an axial direction.
