An instrument for inserting an implant into a vertebral space, comprising: first and second ramps (110, 111), each including: (i) opposing outer and inner surfaces (112, 113, 114, 115), each extending between proximal and distal ends (116; 118; 117, 119) thereof, and (ii) a vertebral contact surface (120, 121) located at the distal end (118, 119) thereof and in opposing relation to the inner surface (114, 115) thereof; and a ramp adjustment assembly operating to: (i) establish an initial non-zero angle between the vertebral contact surfaces (120, 121) of the respective first and second ramps (110, 111); (ii) adjust an initial height between the inner surfaces (114, 115) of the respective first and second ramps (110, 111), measured at the ramp adjustment assembly; and (iii) separate the vertebral contact surfaces (120, 121) of the respective first and second ramps (110, 111), while holding the initial angle and the initial height substantially constant, via simultaneous sliding advancement of the ramp adjustment assembly toward the distal ends (117, 119) of the first and second ramps (110, 111), wherein the ramp adjustment assembly comprises: first and second wedges (152, 154), each including: (i) a base side (152A, 154A) oriented toward the inner surface (114, 115) of a respective one of the first and second ramps (110, 111), and defining a reference plane (152B, 154B), (ii) an incline side (152C, 154C) defining a sliding plane (152D, 154D) that is at an acute angle to the reference plane (152B, 154B), and (iii) a wedge coupling element operating to slidingly engage the incline side of the other of the first and second wedges (152, 154), such that the sliding planes (152D, 154D) of the first and second wedges (152, 154) slide parallel to one another, wherein at least one of the first and second wedges (152A, 154A) includes a ramp coupling element located proximate to the base side thereof and operating to slidingly engage a respective one of the first and second ramps (110, 111) such that the reference plane (152B, 154B) slides substantially parallel thereto. first and second ramps (110, 111), each including: (i) opposing outer and inner surfaces (112, 113, 114, 115), each extending between proximal and distal ends (116; 118; 117, 119) thereof, and (ii) a vertebral contact surface (120, 121) located at the distal end (118, 119) thereof and in opposing relation to the inner surface (114, 115) thereof; and a ramp adjustment assembly operating to: (i) establish an initial non-zero angle between the vertebral contact surfaces (120, 121) of the respective first and second ramps (110, 111); (ii) adjust an initial height between the inner surfaces (114, 115) of the respective first and second ramps (110, 111), measured at the ramp adjustment assembly; and (iii) separate the vertebral contact surfaces (120, 121) of the respective first and second ramps (110, 111), while holding the initial angle and the initial height substantially constant, via simultaneous sliding advancement of the ramp adjustment assembly toward the distal ends (117, 119) of the first and second ramps (110, 111), wherein the ramp adjustment assembly comprises: first and second wedges (152, 154), each including: (i) a base side (152A, 154A) oriented toward the inner surface (114, 115) of a respective one of the first and second ramps (110, 111), and defining a reference plane (152B, 154B), (ii) an incline side (152C, 154C) defining a sliding plane (152D, 154D) that is at an acute angle to the reference plane (152B, 154B), and (iii) a wedge coupling element operating to slidingly engage the incline side of the other of the first and second wedges (152, 154), such that the sliding planes (152D, 154D) of the first and second wedges (152, 154) slide parallel to one another, wherein at least one of the first and second wedges (152A, 154A) includes a ramp coupling element located proximate to the base side thereof and operating to slidingly engage a respective one of the first and second ramps (110, 111) such that the reference plane (152B, 154B) slides substantially parallel thereto. first and second wedges (152, 154), each including: (i) a base side (152A, 154A) oriented toward the inner surface (114, 115) of a respective one of the first and second ramps (110, 111), and defining a reference plane (152B, 154B), (ii) an incline side (152C, 154C) defining a sliding plane (152D, 154D) that is at an acute angle to the reference plane (152B, 154B), and (iii) a wedge coupling element operating to slidingly engage the incline side of the other of the first and second wedges (152, 154), such that the sliding planes (152D, 154D) of the first and second wedges (152, 154) slide parallel to one another, wherein at least one of the first and second wedges (152A, 154A) includes a ramp coupling element located proximate to the base side thereof and operating to slidingly engage a respective one of the first and second ramps (110, 111) such that the reference plane (152B, 154B) slides substantially parallel thereto.