Implants and instruments with flexible features

1. An intervertebral implant comprising:

an upper endplate, a lower endplate opposite the upper endplate and an intermediate support connecting the upper endplate and the lower endplate, the upper endplate and the lower endplate defining a void therebetween, wherein the upper and lower endplates are both adapted to contact a vertebral body of a spine; and

a first portion on one of the upper endplate and the lower endplate, the first portion including a first flexible surface with a plurality of segments that define a plurality of slits, the plurality of slits including a first slit and a second slit, the first slit crossing the second slit between first and second ends of the second slit,

wherein the first portion inclusive of each of the plurality of segments is monolithic, and

wherein the first flexible surface has a surface contour that changes as a function of force borne by the first flexible surface such that when the intervertebral implant is disposed between vertebral bodies, the first flexible surface deforms to adapt to the contours of a bone surface bearing thereon.

2. The intervertebral implant of claim 1 , wherein the first flexible surface is flexible in a direction transverse to a plane that is approximately aligned with the first flexible surface.

3. The intervertebral implant of claim 1 , wherein the first slit has a length extending from a first enclosed end to a second enclosed end opposite the first enclosed end.

4. The intervertebral implant of claim 1 , wherein the plurality of segments include a first segment, a second segment, a third segment and a fourth segment, each segment extending radially from a first location and each segment being oriented differently relative to the first location than the other segments.

5. The intervertebral implant of claim 4 , wherein the plurality of segments are positioned such that a first axis passing through a first midpoint of a first length of the first segment and a second midpoint of a second length of the second segment is orthogonal to a second axis passing through the first midpoint of the first segment and a third midpoint of a third length of the third segment.

6. The intervertebral implant of claim 1 , wherein the plurality of segments interconnect to form rows and columns.

7. The intervertebral implant of claim 4 , wherein each of the first, second, third and fourth segments have the same shape.

8. The intervertebral implant of claim 1 , further comprising a second flexible surface with a second plurality of slits, the second flexible surface being different from the first flexible surface.

9. The intervertebral implant of claim 4 , wherein the first segment includes a first portion, a second portion and a third portion, the first portion being linear and oriented in a first direction, the second portion being linear and oriented in a second direction different from the first direction, and the third portion being linear and oriented in a third direction different from the second direction.

10. The intervertebral implant of claim 1 , further comprising at least one non-flexible surface.

11. The intervertebral implant of claim 1 , wherein each of the plurality of slits extend entirely through the one of the upper endplate and the lower endplate of the intervertebral implant.

12. The intervertebral implant of claim 11 , wherein the plurality of slits include at least two slits that are oriented at different angles relative to the first flexible surface.

13. A method of using an intervertebral implant comprising:

providing the intervertebral implant, the intervertebral implant including a first endplate having a flexible surface, the flexible surface including a first slit with a first length extending between a first enclosed end and a second enclosed end and a second slit with a second length extending between a third enclosed end and a fourth enclosed end, the second slit intersecting the first slit between the first and second enclosed ends, wherein the flexible surface is a monolithic surface;

inserting the intervertebral implant into a final operative location within a patient such that the first endplate abuts a first vertebral body and a second endplate of the intervertebral implant abuts a second vertebral body, and

deforming the first endplate of the intervertebral implant based on force applied to the flexible surface by the first vertebral body, the force causing a uniform surface contour of the flexible surface to become a non-uniform surface contour,

wherein before, during and after the deformation, the first, second, third and fourth enclosed ends remain enclosed such that each enclosed end remains a terminal end of a respective slit in the flexible surface.

14. The method of claim 13 , wherein deforming the endplate of the intervertebral implant occurs while the intervertebral implant is being disposed in the final operative location, the flexible surface conforming to a shape of a surface that applies force to the flexible surface.

15. The method of claim 13 , wherein deforming occurs only in the flexible surface and a peripheral surface of the first endplate retains its shape before and after being subject to force.

16. The method of claim 13 , wherein providing the intervertebral implant includes providing the first endplate such that the first endplate including an entirety of the flexible surface is monolithic.