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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 inf

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.

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What is claimed is: 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 bet

What is claimed is: 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.