vertebral bodies although not limited to the following the texturing can include teeth ridges friction increasing elements keels or gripping or purchasing projections with reference to fig2 and 10 11 in an exemplary embodiment the translation member 18 is sized to be received within the central opening 42 of the body portion 12 and includes at least a first expansion portion 60 in another embodiment the translation member 18 includes a first expansion portion 60 and a second expansion portion 62 the expansion portions 60 62 being connected together via a bridge portion 68 it is also contemplated that there may be more than two expansion portions where each of the expansion portions is connected by a bridge portion the expansion portions 60 62 each have angled surfaces 64 66 configured and dimensioned to engage the ramp surfaces 54 56 of the first and second endplates 14 16 in an exemplary embodiment the translation member 18 also includes recesses 70 72 the recesses 70 72 are sized to receive and retain pins 20 in one embodiment the expansion portion 60 includes an opening 74 which is sized to receive a portion of the actuation member 22 and the expansion portion 62 includes a nose 76 which is received within an opening 78 in the first end 26 to stabilize the translation.