An implant for therapeutically separating bones of a joint, the implant comprising: a first endplate extending between an anterior end and a posterior end, the first end plate having a bone engaging surface, and having at least one anterior ramped surface and at least one posterior ramped surface on a side opposite the bone engaging surface; a second end plate extending between an anterior end and a posterior end, the second end plate having a bone engaging surface, and having at least one anterior ramped surface and at least one posterior ramped surface on a side opposite the bone engaging surface; a posterior actuator positioned between the first and second end plates, the posterior actuator having a corresponding number of first guiding ramp surfaces configured to be positioned opposite the at least one first end plate posterior ramped surface and a corresponding number of second guiding ramp surfaces configured to be positioned opposite the at least one second end plate posterior ramped surface; a pivot member pivotally connected to each first guiding ramp surface and in sliding engagement with the respective at least one first plate posterior ramped surface and a pivot member pivotally connected to each second guiding ramped surface and in sliding engagement with the respective at least one first plate posterior ramped surface; an anterior actuator positioned between the first and second end plates, the anterior actuator having a corresponding number of third guiding ramp surfaces configured to be positioned opposite the at least one first end plate anterior ramped surface and a corresponding number of fourth guiding ramp surfaces configured to be positioned opposite the at least one second end plate anterior ramped surface; a pivot member pivotally connected to each third guiding ramp surface and in sliding engagement with the respective at least one first plate anterior ramped surface and a pivot member pivotally connected to each fourth guiding ramped surface and in sliding engagement with the respective at least one first plate anterior ramped surface; and an actuator assembly (,,) extending between the posterior actuator and the anterior actuator, the actuator assembly configured to selectively move the posterior actuator and the anterior actuator simultaneously, move posterior actuator independently of the anterior actuator, or move the anterior actuator independently of the posterior actuator, wherein each of the anterior and posterior ramped surfaces (116, 118, 136, 138) has a groove (117, 137) extending therealong and each pivot member has a groove engaging flange which engages a respective groove and prevents separation of the pivot member relative to the respective ramped surface. a first endplate extending between an anterior end and a posterior end, the first end plate having a bone engaging surface, and having at least one anterior ramped surface and at least one posterior ramped surface on a side opposite the bone engaging surface; a second end plate extending between an anterior end and a posterior end, the second end plate having a bone engaging surface, and having at least one anterior ramped surface and at least one posterior ramped surface on a side opposite the bone engaging surface; a posterior actuator positioned between the first and second end plates, the posterior actuator having a corresponding number of first guiding ramp surfaces configured to be positioned opposite the at least one first end plate posterior ramped surface and a corresponding number of second guiding ramp surfaces configured to be positioned opposite the at least one second end plate posterior ramped surface; a pivot member pivotally connected to each first guiding ramp surface and in sliding engagement with the respective at least one first plate posterior ramped surface and a pivot member pivotally connected to each second guiding ramped surface and in sliding engagement with the respective at least one first plate posterior ramped surface; an anterior actuator positioned between the first and second end plates, the anterior actuator having a corresponding number of third guiding ramp surfaces configured to be positioned opposite the at least one first end plate anterior ramped surface and a corresponding number of fourth guiding ramp surfaces configured to be positioned opposite the at least one second end plate anterior ramped surface; a pivot member pivotally connected to each third guiding ramp surface and in sliding engagement with the respective at least one first plate anterior ramped surface and a pivot member pivotally connected to each fourth guiding ramped surface and in sliding engagement with the respective at least one first plate anterior ramped surface; and an actuator assembly (,,) extending between the posterior actuator and the anterior actuator, the actuator assembly configured to selectively move the posterior actuator and the anterior actuator simultaneously, move posterior actuator independently of the anterior actuator, or move the anterior actuator independently of the posterior actuator, wherein each of the anterior and posterior ramped surfaces (116, 118, 136, 138) has a groove (117, 137) extending therealong and each pivot member has a groove engaging flange which engages a respective groove and prevents separation of the pivot member relative to the respective ramped surface.