An interbody spacer assembly includes a pair of end pieces spaced apart by
a connector extending between them. The end pieces extend generally
parallel to the end plates of adjoining vertebral bodies. Fasteners
connect the end pieces to the vertebral bodies. Bone graft material or
solid bone can be placed in the interior space defined by the end pieces
and connector, which bone graft material or solid bone eventually fuses
together and to the adjoining end plates through the end pieces.