Modular interbody spacer

1. An intervertebral spinal spacer comprising:

(a) a first portion of a modular spacer, the first portion having an upper surface, a lower surface, and an outer surface;

(b) a second portion of the modular spacer, the second portion having an upper surface a lower surface, and an outer surface, wherein the first portion is selectively engageable with the second portion, wherein at least one of the first portion or the second portion of the modular spacer defines one or more internal cavities; and

(c) at least one fluid passage defined by the first portion or the second portion, the at least one fluid passage being curved and being in fluid communication with at least one of the one or more internal cavities.

2. The intervertebral spinal spacer of claim 1 , wherein the first portion or the second portion of the modular spacer includes a plurality of outer apertures.

3. The intervertebral spinal spacer of claim 2 , wherein the first portion or the second portion of the modular spacer includes a plurality of inner apertures, the plurality of inner apertures being defined by an inner surface of an internal cavity defined by the modular spacer.

4. The intervertebral spinal spacer of claim 3 , wherein the one or more fluid passages connect each respective outer aperture to a corresponding inner aperture such that fluid communicates from the plurality of outer apertures, through the one or more fluid passages, and into at least one of the one or more internal cavities of the modular spacer.

5. The intervertebral spinal spacer of claim 1 , further comprising an instrument conduit, wherein the instrument conduit is a passageway defined by the first portion or the second portion of the modular spacer.

6. The intervertebral spinal spacer of claim 5 , wherein the instrument conduit is sized to receive a suction device.

7. The intervertebral spinal spacer of claim 1 , wherein the first portion is operably configured to mate with the second portion such that a customized modular spacer is formed.

8. The intervertebral spinal spacer of claim 1 , further comprising at least one fastener to attach the modular spacer to an anatomical structure.

9. The intervertebral spinal spacer of claim 1 , wherein the upper surface or the lower surface of the first portion or the second portion includes an interface that facilitates attachment to bone.

10. The intervertebral spinal spacer of claim 1 , wherein the modular spacer provides zero profile spinal fusion.

11. The intervertebral spinal spacer of claim 1 , wherein the first portion of the modular spacer is selectable from a plurality of sizes having different widths such that the first portion is customizable to a patient's anatomy.

12. The intervertebral spinal spacer of claim 11 , wherein the second portion of the modular spacer is selectable from a plurality of sizes having different depths such that the second portion is customizable to the patient's anatomy.

13. The intervertebral spinal spacer of claim 1 , wherein the first portion includes a first attachment member and the second portion includes a second attachment member such that the first portion and the second portion are interlocked.

14. The intervertebral spinal spacer of claim 1 , wherein each of the one or more internal cavities has a sidewall extending between an upper opening on the respective upper surface and a lower opening on the respective lower surface of the first portion or the second portion defining the internal cavity, and the at least one fluid passage extends between an inner aperture on the sidewall and an outer aperture on the respective upper surface of the first portion or the second portion.

15. An intervertebral spinal spacer comprising:

(a) a first portion of a modular spacer, the first portion being selectable from a plurality of spacer elements having different sizes, the first portion having an upper surface, a lower surface, an outer surface, and a first attachment member;

(b) a second portion of the modular spacer, the second portion being selectable from the plurality of spacer elements having different sizes, the second portion having an upper surface a lower surface, an outer surface, and a second attachment member, wherein the first attachment member is engaged with the second attachment member to interlock the first portion and the second portion, wherein at least one of the first portion or the second portion of the modular spacer defines one or more internal cavities; and

(c) at least one fluid passage defined by the first portion or the second portion, the at least one fluid passage being curved and being in fluid communication with at least one of the one or more internal cavities.

16. The intervertebral spinal spacer of claim 15 , wherein the first portion of the modular spacer is selectable from a plurality of sizes having different widths.

17. The intervertebral spinal spacer of claim 15 , wherein the second portion of the modular spacer is selectable from a plurality of sizes having different depths.

18. The intervertebral spinal spacer of claim 15 , further comprising a third portion of the modular spacer being selectable from the plurality of spacer elements having different sizes for attachment to the modular spacer.

19. A kit for an intervertebral spacer comprising:

(a) a plurality of anterior portions for a modular spacer, each of the plurality of anterior portions for the modular spacer having a different size;

(b) a plurality of posterior portions for a modular spacer, each of the plurality of posterior portions for the modular spacer having a different size, wherein at least one of the first portion or the second portion of the modular spacer defines one or more internal cavities; and

(c) a plurality of fluid passages defined by at least one of the plurality of anterior portions or plurality of posterior portions, the plurality of fluid passages being curved and being in fluid communication with at least one of the one or more internal cavities,

wherein at least one of the plurality of anterior portions is interlocked with at least one of the plurality of posterior portions.

20. The kit for an intervertebral spacer of claim 19 , wherein each of the plurality of anterior portions has a different width and each of the plurality of posterior portions has a different depth.