An intervertebral implant including a first substantially pyramidal-shaped wedge having: a first pair of laterally extending flanges, and a second pair of laterally extending flanges spaced from the first pair of laterally extending flanges; an upper body having an inferior surface, a superior surface, and a pair of recessed tracks for receiving the first pair of laterally extending flanges; and a lower body having a superior surface, an inferior surface, and a pair of recessed tracks for receiving the second pair of laterally extending flanges. The first substantially pyramidal-shaped wedge is movable between a first position and a second position within the recessed tracks of the upper body and the lower body. The intervertebral implant also includes a case housing the first substantially pyramidal-shaped wedge.