A vertebral implant includes a body including an outer surface and an aperture forming an inner cavity. A gear including a plurality of teeth is rotatable within the cavity about a rotation axis. An anchor including a bone-engaging feature to engage the vertebral members may be operatively coupled to the gear. The gear teeth may be accessible from outside the body to rotate the gear. The anchor may be movable substantially along the rotation axis between a first position in which the bone-engaging feature is retracted below the outer surface and a second position in which the bone-engaging feature is extended above the outer surface.