into the adjacent vertebral body referring to fig4 f and 4g the anterior posterior corrective plate 124 is provided with a downwardly extending edge 130 for engagement with the pistons as they differentially expand to ensure that wedge plate stays firmly in place plate 124 provides anterior posterior correction in that it can be angled front to back like a wedge with a correction angle a of 0 5 degrees or more plate 124 also defines bone graft cavity 114 for enabling bone growth conductive or inductive agents to communicate directly with the engaged vertebral endplate the sec is optionally provided with a lordosis base plate 132 that includes a bone engaging surface defining a cavity co extensive with bone graft cavity 114 for enabling perfusion of bone graft material into the adjacent engaged vertebral body lordosis base plate 132 also has an anterior posterior angle b refer to fig4 g of 0 5 degrees for correcting lordosis referring to fig4 g top plate 124 and optional lordosis base plate 132 function as two endplates providing a corrective surface that impacts vertebral bodies for spinal correction top plate 124 and lordosis base plate 132 each include a bone engaging surface 125.