A spinal cage (10) includes a first support plate (12) pivotally connected to a second support plate (14) by a hinge (16), and a plate mover (18) actuated by an actuator (22) and located between the first and second support plates (12, 14). The plate mover (18) is arranged to slide against an inclined surface (20) on the first support plate (12). A hinge (16) is journaled in an elongate aperture (24) formed in a hinge housing (26) protruding from first support plate (12), the hinge (16) being free to translate and rotate in the elongate aperture (24).
