A spinal cage system for inserting a spinal cage assembly into a spine to separate and support adjacent spinal vertebrae, includes a first cage member; a second cage member; and an articulating mechanism adapted to connect the first cage member to the second cage member and to permit the first and second cage members to move relate to each other. An insertion instrument is adapted to capture the spinal cage assembly for insertion of the spinal cage assembly into a spine and to rotate the first and second cage members relative to each other to achieve a desired orientation in the spine.