A device to space apart vertebral members, the device comprising: a first endplate comprising a first engagement surface and first and second extensions (46a, 46b, 50, 48a) that each extend away from the first engagement surface, the first extension (46a, 46b) comprising a first ramp (56a, 56b, 62) and the second extension comprising a first slot; a second endplate comprising a second engagement surface and third and fourth extensions (72a, 72b, 74a) that each extend away from the second engagement surface, the third extension (72a, 72b) comprising a second ramp (82a, 82b) and the fourth extension comprising a second slot; a wedge positioned between the endplates (22, 24), the wedge comprising an upper surface having a first inclined portion (108a, 108b, 114a, 114b) that slidably engages the first ramp (56a, 56b, 62) and a lower surface having a second inclined portion (116a, 122a) that slidably engages the second ramp (82a, 82b), the wedge comprising first and second apertures (130c, 130d, 130a, 130b); a first pin extending through the first aperture (130c, 130d) and the first slot; and a second pin extending through the second aperture (130a, 130b) and the second slot, further comprising a frame comprising a wall having an inner surface that defines an interior cavity, the wall of the frame being positioned between the third and the fourth extensions (72a, 72b, 74a) of the second endplate and between the first and the second extensions (46a, 46b, 48a) of the first endplate, the ramps (56a, 56b, 82a, 82b) and the wedge being positioned within the interior cavity as the device moves between the first and second configurations, wherein the wedge is movable relative to the endplates (22, 24) to move the device between a first configuration having a first height between the engagement surfaces (42, 68) and a second configuration having an increased second height between the engagement surfaces (42, 68). a first endplate comprising a first engagement surface and first and second extensions (46a, 46b, 50, 48a) that each extend away from the first engagement surface, the first extension (46a, 46b) comprising a first ramp (56a, 56b, 62) and the second extension comprising a first slot; a second endplate comprising a second engagement surface and third and fourth extensions (72a, 72b, 74a) that each extend away from the second engagement surface, the third extension (72a, 72b) comprising a second ramp (82a, 82b) and the fourth extension comprising a second slot; a wedge positioned between the endplates (22, 24), the wedge comprising an upper surface having a first inclined portion (108a, 108b, 114a, 114b) that slidably engages the first ramp (56a, 56b, 62) and a lower surface having a second inclined portion (116a, 122a) that slidably engages the second ramp (82a, 82b), the wedge comprising first and second apertures (130c, 130d, 130a, 130b); a first pin extending through the first aperture (130c, 130d) and the first slot; and a second pin extending through the second aperture (130a, 130b) and the second slot, further comprising a frame comprising a wall having an inner surface that defines an interior cavity, the wall of the frame being positioned between the third and the fourth extensions (72a, 72b, 74a) of the second endplate and between the first and the second extensions (46a, 46b, 48a) of the first endplate, the ramps (56a, 56b, 82a, 82b) and the wedge being positioned within the interior cavity as the device moves between the first and second configurations, wherein the wedge is movable relative to the endplates (22, 24) to move the device between a first configuration having a first height between the engagement surfaces (42, 68) and a second configuration having an increased second height between the engagement surfaces (42, 68).