A spinal fusion implant has a parallelepiped main body with a rotatablymounted retentionplate secured to its distal end. The distal retention plate has a firstposition co-planar with themain body and a second, deployed position normal to the plane of the mainbody. The distalretention plate is in the first position when the main body is insertedbetween adjacentvertebral bodies and is in the second position after the main body is insertedbetweenadjacent vertebral bodies. In further embodiments, a proximal retention plateis permanentlydeployed in normal relation to the main body or both the distal and proximalretention platesare rotatably mounted and both are deployed co-planar to the main body beforeinsertion andnormal to the main body after insertion.
