The present invention is directed to a variety of interbody spinal fusion implants
having at least a partially frusto-conical configuration. The spinal fusion implants
of the present invention may be relatively solid or hollow and may have surface
roughenings to promote bone ingrowth and stability. The spinal fusion implants
of the present invention may have wells extending into the material of the implant
from the surface for the purpose of holding fusion promoting materials and to provide
for areas of bone ingrowth fixation. A variety of surface irregularities may be
employed to increase implant stability and implant surface area, and/or for the
purpose of advancing the spinal fusion implant into the fusion site.
