a composite interbody device for use with spinal fusion surgery is described herein . the composite interbody device comprises a central body made from a radiolucent biocompatible polymer and metallic plates , which are placed at the superior and inferior surfaces of the central body . the metallic plates are comprised of an end plate that is adjacent to a vertebral body and an intermediate plate that is adjacent to the central body . the end plates may have one or more arrays of apertures to facilitate bone growth into the end plates to secure the interbody device within the intervertebral space . the intermediate plates may also have one or more arrays of apertures to allow the central body to bond to the end plates through compression molding , injection molding , and / or heat molding . the arrays of apertures in the end plates are not aligned with the arrays of apertures in the intermediate plates so that polymer material of the central body will not penetrate into the end plate , where bone growth is encouraged , and vice versa .