An interbody spinal implant comprising cortical bone having a width less than one-half the width of the disc space into which it is adapted to be inserted. The implant has a leading end that is asymmetrical from side to side and/or includes a straight portion adapted to be used in side-by-side pairs...http://www.google.com/patents/US8137403?utm_source=gb-gplus-sharePatent US8137403 - Hemi-interbody spinal fusion implants manufactured from a major long bone ring
