A lumbar fusion implant device has a pair of first and second body structures. The first body structure has a pair of appendages with enlarged rounded ends, the appendages projecting from the opposite sides of the first body structure. Similarly, the second body structure has a pair of appendages with enlarged rounded ends with the appendages projecting from opposite sides of the second body structure. Each of the enlarged ends of the appendages fit into sockets on an opposite first or second body structure and when the first and second body structures are longitudinally connected by a threaded fastener, tightening of the fastener moves the first and second body structures closer together expanding radially outwardly each appendage.