A device to space apart vertebral members, the device comprising: a first endplate comprising a first engagement surface and first and second extensions that each extend away from the first engagement surface , the first extension comprising a first ramp and the second extension comprising a first slot ; a second endplate comprising a second engagement surface and third and fourth extensions that each extend away from the second engagement surface , the third extension comprising a second ramp and the fourth extension comprising a second slot ; a wedge positioned between the endplates , the wedge comprising an upper surface having a first inclined portion that slidably engages the first ramp and a lower surface having a second inclined portion that slidably engages the second ramp , the wedge comprising first and second apertures , wherein the wedge is movable relative to the endplates to move the device between a first configuration having a first height between the engagement surfaces and a second configuration having an increased second height between the engagement surfaces ; a first pin extending through the first aperture and the first slot ; a second pin extending through the second aperture and the second slot ; a frame having an interior cavity , the ramps and the wedge being positioned within the interior cavity as the device moves between the first and second configurations; a pivot coupled to the frame ; and an actuator that extends through the pivot , wherein rotation of the actuator relative to the pivot translates the actuator such that the wedge moves relative to the endplates to move the device between the first and second configurations, wherein the actuator is a screw having a ball tip , the ball tip being positioned within an arcuate track in the wedge . a first endplate comprising a first engagement surface and first and second extensions that each extend away from the first engagement surface , the first extension comprising a first ramp and the second extension comprising a first slot ; a second endplate comprising a second engagement surface and third and fourth extensions that each extend away from the second engagement surface , the third extension comprising a second ramp and the fourth extension comprising a second slot ; a wedge positioned between the endplates , the wedge comprising an upper surface having a first inclined portion that slidably engages the first ramp and a lower surface having a second inclined portion that slidably engages the second ramp , the wedge comprising first and second apertures , wherein the wedge is movable relative to the endplates to move the device between a first configuration having a first height between the engagement surfaces and a second configuration having an increased second height between the engagement surfaces ; a first pin extending through the first aperture and the first slot ; a second pin extending through the second aperture and the second slot ; a frame having an interior cavity , the ramps and the wedge being positioned within the interior cavity as the device moves between the first and second configurations; a pivot coupled to the frame ; and an actuator that extends through the pivot , wherein rotation of the actuator relative to the pivot translates the actuator such that the wedge moves relative to the endplates to move the device between the first and second configurations, wherein the actuator is a screw having a ball tip , the ball tip being positioned within an arcuate track in the wedge . <EOS>