A spinal implant is provided that includes a body having at least one piece of cortical bone. The body has a tapered leading end, a trailing end and first and second sides. The body also includes superior and inferior surfaces that are inclined relative to one another. A first plurality of grooves is formed in the superior surface and a second plurality of the grooves is formed in the inferior surface. Each groove of the first and second pluralities of the grooves has first and second opposing faces converging toward and intersecting one another. Each groove has a maximum cross-sectional width. Each adjacent pair of the grooves of the first and second pluralities of the grooves is separated by a generally planar portion of the superior and inferior surfaces, respectively. Each of the generally planar portions has a width that is equal to or greater than the maximum cross-sectional width of each of the grooves of the respective adjacent pair of the grooves.