A spinal spacer 300 for engagement between vertebrae is provided which includes a body 301 formed of a bone composition. The body 301 includes a first end 311 , an opposite second 315 end, a superior face 335 defining a superior vertebral engaging surface 337 and an inferior face 338 defining an inferior vertebral engaging surface 340 . At least one of the vertebral engaging surfaces defines a set of migration resistance grooves 350 . Each of the grooves 350 includes a first face 355 defining an angle of no more than about 90 degrees relative to the engaging surface 340 and a second opposing sloped face 360 . The first and second faces 355, 360 define an arcuate pocket 370 therebetween for trapping vertebral bone to resist migration of the spacer 300 . In one embodiment, the grooves 350 are arranged in series in that all of the second faces 360 slope in the same direction.
1. A bone graft for insertion between adjacent vertebrae, said graft comprising a cortical bone slice from a long bone, said cortical bone slice comprising:
a substantially planar superior bone engaging surface;
an opposite inferior bone engaging surface; and
a wall provided between the superior bone engaging surface and the inferior bone engaging surface, said wall comprising an anterior wall portion having a convexly curved exterior surface, and an opposite posterior wall portion, wherein the graft comprises a first set of migration resistant surface features comprising grooves, teeth, blades or a combination thereof.
2. The graft of claim 1 comprising a second set of migration resistant surface features.
3. The graft of claim 1 wherein the inferior bone engaging surface is substantially planar.
4. The graft of claim 1 wherein the superior bone engaging surface and the inferior bone engaging surface include migration resistant surface features.
5. A bone graft for insertion between adjacent vertebrae, said graft comprising a cortical bone slice from a long bone, said cortical bone slice comprising:
a superior bone engaging surface;
an opposite inferior bone engaging surface; and
a first lateral wall positioned between the inferior bone engaging surface and the superior bone engaging surface and provided to lie substantially perpendicular to the superior bone engaging surface; said lateral wall positioned between a posterior wall and an anterior wall having a convexly curved exterior surface, and wherein said graft comprises a first set of migration resistant surface features selected from the group consisting of: grooves, teeth, blades or a combination thereof.
6. The graft of claim 5 comprising a second lateral wall opposite the first lateral wall.
7. The graft of claim 6 wherein the second lateral wall is provided to lie substantially perpendicular to the superior bone engaging surface.
8. The graft of claim 5 wherein the posterior wall is substantially planar.
9. The graft of claim 5 wherein the first set of migration resistant surface features are arranged in series.
10. The graft of claim 5 comprising a second set of migration resistant surface features.
11. The graft of claim 5 comprising an interior chamber.
12. The graft of claim 11 wherein the bone engaging superior surface defines a first opening and the inferior bone engaging surface defines a second opening, wherein each of the first and second openings are in communication with the chamber.
13. The graft of claim 5 comprising an osteoinductive material.
14. The graft of claim 5 comprising cancellous bone material.
15. The graft of claim 4 wherein the superior bone engaging surface and the inferior bone engaging surface comprise migration resistant surface features.