An expandable intervertebral implant (210; 410) comprising: top and bottom plates (220, 250; 420, 450) having inner and outer surfaces (226, 256, 224, 254; 426, 456, 424, 454), the top and bottom plates each having first apertures (230; 430) extending through the inner and outer surfaces thereof, the inner surfaces facing each other and each having a ramp surface (222, 252; 422; 452); an actuator (280; 480) situated between the inner surfaces of the top and bottom plates; and first and second expansion members (300, 302; 500, 502) coupled to the actuator (280; 480) and located between the inner surfaces of the top and bottom plates (220, 250; 420, 450), the expandable intervertebral implant (210, 410) being characterized in that the first and second expansion members each have a vertical projection (312, 314; 512, 514) extending outwardly therefrom, wherein rotation of the actuator (280; 480) in opposing directions causes the first and second expansion members (300, 302; 500, 502) to move toward and away from one another along a longitudinal axis of the actuator, resulting in movement of the top and bottom plates (220, 250; 420, 450) along a vertical axis perpendicular to the longitudinal axis, each vertical projection (312, 314; 512, 514) being received and guided at least partially within its associated first aperture (230; 430) while the top and bottom plates (300, 302; 500, 502) move along the vertical axis, wherein each first aperture (230; 430) is elongated in a direction substantially aligned with the longitudinal axis of the actuator (280; 480) to allow the vertical projection to translate axially within its associated first aperture (230; 430). top and bottom plates (220, 250; 420, 450) having inner and outer surfaces (226, 256, 224, 254; 426, 456, 424, 454), the top and bottom plates each having first apertures (230; 430) extending through the inner and outer surfaces thereof, the inner surfaces facing each other and each having a ramp surface (222, 252; 422; 452); an actuator (280; 480) situated between the inner surfaces of the top and bottom plates; and first and second expansion members (300, 302; 500, 502) coupled to the actuator (280; 480) and located between the inner surfaces of the top and bottom plates (220, 250; 420, 450), the expandable intervertebral implant (210, 410) being characterized in that the first and second expansion members each have a vertical projection (312, 314; 512, 514) extending outwardly therefrom, wherein rotation of the actuator (280; 480) in opposing directions causes the first and second expansion members (300, 302; 500, 502) to move toward and away from one another along a longitudinal axis of the actuator, resulting in movement of the top and bottom plates (220, 250; 420, 450) along a vertical axis perpendicular to the longitudinal axis, each vertical projection (312, 314; 512, 514) being received and guided at least partially within its associated first aperture (230; 430) while the top and bottom plates (300, 302; 500, 502) move along the vertical axis, wherein each first aperture (230; 430) is elongated in a direction substantially aligned with the longitudinal axis of the actuator (280; 480) to allow the vertical projection to translate axially within its associated first aperture (230; 430).