An apparatus for implementing an improved spinal fusion cage have a centrally-located fixation screwhole of diameter minimized to accommodate a variable-angle, intervertebral, cannulated fixation screw is disclosed. The system includes a rigid connection between the spinal fusion cage to the shaft of the fixation screw, and a variable angle drill targeting device for directing the fixation screw through the on-visually acquirable, centrally-located fixation screwhole without X-ray or other imaging guidance.