Interbody fusion device

1. An interbody spacer system for the spine comprising:

a helically-shaped wire;

a spacer; and

a plate having a hole comprising a helically shaped groove through which the helically-shaped wire is configured to engage and pass to secure the plate to a vertebral body adjacent to the spacer, wherein the helically shaped groove is directly formed in the plate, wherein a proximal surface of the plate comprises a notch at an interface with the hole, wherein the notch extends the helically shaped groove to the proximal surface of the plate, wherein the notch is configured to engage the helically-shaped wire and direct the initial placement of a tip of the helically-shaped wire into the vertebral body.

2. The system of claim 1 , wherein the hole through which the helically-shaped wire passes is of corresponding diameter and pitch as the helically-shaped wire.

3. The system of claim 1 , wherein the hole through which the helically-shaped wire passes is smaller in diameter than the outer diameter of the helically-shaped wire.

4. The system of claim 1 , wherein the plate is attached to the spacer.

5. The system of claim 1 , wherein the plate comprises an upper portion and a lower portion, wherein the upper portion comprises the hole.

6. The system of claim 1 , wherein the notch is configured to maintain the final position of the helically-shaped wire.

7. An interbody spacer system for the spine comprising:

a helically-shaped fixation device comprising a distal tip; and

a flanged interbody device comprises a plate and a spacer, the plate comprising a hole configured to accept the helically-shaped fixation device to secure the plate to a vertebral body adjacent to the spacer, wherein a helical groove is directly formed in the plate to provide a rotational starting point for the distal tip and a rotational ending point for the distal tip such that the distal tip is configured to contact the vertebral body at a pre-determined angle relative to the plate, wherein a groove at the interface with a proximal surface of the plate is directly formed in the plate to provide a rotational starting point for the distal tip, and wherein the helical groove and the groove are configured to engage the distal tip of the helically-shaped fixation device.

8. The system of claim 7 , further comprising a feature configured to limit rotation of the helically-shaped fixation device.

9. The system of claim 7 , further comprising a corresponding feature of the helically-shaped fixation device configured to interact with the groove to limit further insertion of the helically-shaped fixation device.

10. The system of claim 7 , wherein the spacer is integral with the plate.