Spinal interbody spacer

A spinal spacer for engagement between vertebrae, comprising:

• a body defined along a longitudinal centerline axis and having a substantially contoured first end surface at a distal end of the body and a second end surface opposite thereto at a proximal end of the body,
• the body extending between the first and second end surfaces to define top and bottom vertebral engaging surfaces, the top and bottom vertebral engaging surfaces disposed opposite to one another, the body further defining opposed side surfaces,
• the body being configured such that the top and bottom vertebral engaging surfaces intersect with the side surfaces to provide a substantially quadrilateral cross-section with rounded corners,
• the body being configured such that the top and bottom vertebral engaging surfaces have a substantially streamlined convex profile, and
• the body being configured such that at least one of the top and bottom vertebral engaging surfaces further comprises a first, a second, and a third surface region, the first surface region disposed distally of the second surface region, the third surface region contiguous with the first surface region and aligned with the substantially streamlined convex profile so as to form rounded surfaces, each surface region having distinct surface characteristics, both the first and second surface regions having a plurality of protrusions with a configuration, each of the protrusions on the first surface region having a pair of walls with a groove therethrough, the plurality of protrusions of the first surface region further defining a set of channels extending along the body in the direction of the longitudinal centerline axis and being substantially symmetrical about the longitudinal axis,
• the channels having a substantially semi-cylindrical cross-section,
• each of the protrusions of the second surface region being substantially pyramidal and differing from the configuration of the plurality of protrusions of the first surface region
• the second surface region disposed between the first surface region and the proximal end of the body;
• wherein the first surface region is separated from the second surface region by a border, the border extending perpendicular to the longitudinal centerline axis, such that the border intersects the opposed side surfaces of the body;
• wherein the top vertebral engaging surface includes a first aperture and a second aperture, the first and second apertures partially extending through the body, the first aperture disposed toward the first end surface of the body on the third surface region, and the second aperture disposed toward the second end surface of the body between the border and the plurality of protrusions of the second surface region;
• wherein the bottom vertebral engaging surface includes a third aperture partially extending through the body, the third aperture disposed toward the second end surface of the body between the border and the second surface region;
• and
• wherein the first and second apertures are aligned with respect to each other on the top vertebral engaging surface, and the second and third apertures are disposed in opposed relation to each other with respect to the longitudinal centerline axis.