An interbody spinal implant made of cortical bone or a bone composite
adapted for placement across an intervertebral space formed across the
height of a disc space between two adjacent vertebral bodies. The implant
has a leading end that includes at least a portion of an arc of a circle
from side to side, and sides that are at least in part straight or a
trailing end having a radius of curvature of another circle from side to
side.