Bone anchoring nail

1. A bone anchoring nail comprising:

a shaft with a free end,

a head opposite to the free end along a longitudinal axis of the shaft, the head having a substantially U-shaped recess forming two legs for accommodation of a rod-shaped element between the two legs,

a locking element configured to secure to the head to lock a rod-shaped element in the U-shaped recess,

a longitudinal bore extending into the shaft and opening towards at least one of the head and the free end,

the shaft comprising a shaft section having a first end and a second end that are spaced apart along the longitudinal axis,

wherein the shaft section comprises a plurality of openings extending through a wall of the shaft and being in communication with the bore, and

wherein at least the shaft section is threadless along its entire exterior surface.

2. The bone anchoring nail of claim 1 , wherein the bore is open towards the head and closed at the second end.

3. The bone anchoring nail of claim 1 , wherein the shaft has a substantially cylindrical shape.

4. The bone anchoring nail of claim 1 , wherein the openings have a round cross-section.

5. The bone anchoring nail of claim 1 , wherein the openings extend in a radial direction from the shaft axis.

6. The bone anchoring nail of claim 1 , wherein the exterior surface of the shaft section is roughened to enhance fixation.

7. The bone anchoring nail of claim 1 , wherein the shaft and the head are mono-axially connected.

8. The bone anchoring nail of claim 1 , wherein all openings extending through the wall of the shaft and in communication with the bore are located in the shaft section.

9. The bone anchoring nail of claim 1 , wherein the first end of the shaft section is closer to the head than the second end of the shaft section and the entire exterior surface of the shaft is threadless from the free end to the first end of the shaft section.

10. A method of anchoring a bone anchoring nail to a bone, the bone anchoring nail comprising:

a shaft with a free end,

a head opposite to the free end along a longitudinal axis of the shaft, the head having a substantially U-shaped recess forming two legs for accommodation of a rod-shaped element between the two legs,

a longitudinal bore extending into the shaft and opening towards at least one of the head and the free end,

the shaft comprising a shaft section having a first end and a second end that are spaced apart along the longitudinal axis,

wherein the shaft section comprises a plurality of openings extending through a wall of the shaft and being in communication with the bore,

wherein at least the shaft section is threadless along its entire exterior surface,

the method comprising:

creating a core hole in a bone;

inserting the shaft into the core hole; and

inserting a rod-shaped element in the U-shaped recess and securing the rod shaped element in the U-shaped recess.

11. The method of claim 10 , further comprising inserting bone material in the longitudinal bore.

12. A bone anchoring nail assembly comprising:

a bone anchoring nail, comprising:

a shaft with a free end,

a head opposite to the free end along a longitudinal axis of the shaft, the head having a substantially U-shaped recess forming two legs for accommodation of a rod-shaped element between the two legs,

a longitudinal bore extending into the shaft and opening towards at least one of the head and the free end,

the shaft comprising a shaft section having a first end and a second end that are spaced apart along the longitudinal axis,

wherein the shaft section comprises a plurality of openings extending through a wall of the shaft and being in communication with the bore, and

wherein at least the shaft section is threadless along its entire exterior surface; and

a rod-shaped element configured to be received in the U-shaped recess of the head such that it can be fastened in the U-shaped recess of the head.

13. The bone anchoring nail assembly of claim 12 wherein the shaft and the head are monolithic.