A spinal cage (80) including first and second spinal attachment members (82, 84) attachable to vertebrae (83, 85), the first and second spinal attachment members (82, 84) articulating with one another by means of an articulation joint (86, 88), characterised by a wedge element (90) arranged for wedging between the first and second spinal attachment members (82, 84), and an actuator (92) linked to the wedge element (90) for moving the wedge element (90) in a direction that wedges the wedge element (90) further in between the first and second spinal attachment members (82, 84) or further away from the first and second spinal attachment members (82, 84).
