An inter-body fusion device for use in surgery comprising: a first plate having a leading edge, a trailing edge, an upper bone contact surface, an opposed first plate inner surface, and a first plate longitudinal axis; a second plate having a leading edge, a trailing edge, a lower bone contact surface, an opposed second plate inner surface, and a second plate longitudinal axis, wherein the first plate substantially overlies the second plate and is positioned such that the first plate longitudinal axis and the second plate longitudinal axis form a device angle; and an insert comprising a first member having a leading edge and a trailing edge, and a second member having a leading edge and a trailing edge, the insert positioned substantially therebetween the first plate and the second plate, wherein movement of the first member longitudinally with respect to the first and second plates (100, 200) increases a distance between a portion of the leading edge (102, 202) of the first and second plates (100, 200) and movement of the second member longitudinally with respect to the first and second plates (100, 200) increases the distance between a portion of the trailing edge (104, 204) of the first and second plates (100, 200), characterized in that both the first member and the second member each include an upper plate contact surface (310, 326) and a lower plate contact surface (312, 328), and the first and second members (302, 304) are physically separate and operate independently and are configured to allow selectively altering both the distance between the first plate and the second plate and the device angle. a first plate having a leading edge, a trailing edge, an upper bone contact surface, an opposed first plate inner surface, and a first plate longitudinal axis; a second plate having a leading edge, a trailing edge, a lower bone contact surface, an opposed second plate inner surface, and a second plate longitudinal axis, wherein the first plate substantially overlies the second plate and is positioned such that the first plate longitudinal axis and the second plate longitudinal axis form a device angle; and an insert comprising a first member having a leading edge and a trailing edge, and a second member having a leading edge and a trailing edge, the insert positioned substantially therebetween the first plate and the second plate, wherein movement of the first member longitudinally with respect to the first and second plates (100, 200) increases a distance between a portion of the leading edge (102, 202) of the first and second plates (100, 200) and movement of the second member longitudinally with respect to the first and second plates (100, 200) increases the distance between a portion of the trailing edge (104, 204) of the first and second plates (100, 200), characterized in that both the first member and the second member each include an upper plate contact surface (310, 326) and a lower plate contact surface (312, 328), and the first and second members (302, 304) are physically separate and operate independently and are configured to allow selectively altering both the distance between the first plate and the second plate and the device angle.