Disclosed herein is a stand-alone anterior fusion device that is positioned in the space between adjacent vertebrae to be fused. The device comprises an annular cage having a thickness defined by an outer surface and an inner surface. The inner surface is defined by a cavity adapted to receive graft material. A top surface is in a spatial relationship to a bottom surface and may be further defined by a Lordosis angle. Ascending and descending guides extend through the wall, each guide has an axis defined by an attitude, where each guide directs a vertebral screw in a desired trajectory into the adjacent vertebrae whereby a bi-cortical screw purchase may be achieved. The device is a stand alone stabilizing device as well as a cage for containing graft material and maintaining the height of the space between the vertebrae to be fused.
