A spinal implant for placement between first and second vertebral bodies, comprising: at least one first member (113; 2222, 2223; 2240, 2242, 2244, 2246) having a surface for engaging a first vertebral body; a second member cooperating with the first member and having a surface for engaging a second vertebral body; at least a first extendable support element and a second extendable support element, each of the first and second extendable support elements being independently extendable between a respective contracted configuration to facilitate deployment of the implant between the superior and inferior vertebral bodies and at least one respective extended configuration to extend the at least one first member away from the second member so that the surface thereof engages the first vertebral body; and a first vertical constraint; and a second vertical constraint; characterized in that: the first vertical constraint is associated with the first extendable support element, and the first vertical constraint cooperates between the first extendable support element and the second member to limit a first maximum height the first extendable support element is permitted to extend the at least one first member away from the second member; the second vertical constraint is associated with the second extendable support element, and the second vertical constraint cooperates between the second extendable support element and the second member to limit a second maximum height that the second extendable support element is permitted to extend the at least one first member away from the second member; and wherein the first vertical constraint and the second vertical constraint are configured such that the first maximum height is different than the second maximum height. at least one first member (113; 2222, 2223; 2240, 2242, 2244, 2246) having a surface for engaging a first vertebral body; a second member cooperating with the first member and having a surface for engaging a second vertebral body; at least a first extendable support element and a second extendable support element, each of the first and second extendable support elements being independently extendable between a respective contracted configuration to facilitate deployment of the implant between the superior and inferior vertebral bodies and at least one respective extended configuration to extend the at least one first member away from the second member so that the surface thereof engages the first vertebral body; and a first vertical constraint; and a second vertical constraint; characterized in that: the first vertical constraint is associated with the first extendable support element, and the first vertical constraint cooperates between the first extendable support element and the second member to limit a first maximum height the first extendable support element is permitted to extend the at least one first member away from the second member; the second vertical constraint is associated with the second extendable support element, and the second vertical constraint cooperates between the second extendable support element and the second member to limit a second maximum height that the second extendable support element is permitted to extend the at least one first member away from the second member; and wherein the first vertical constraint and the second vertical constraint are configured such that the first maximum height is different than the second maximum height. the first vertical constraint is associated with the first extendable support element, and the first vertical constraint cooperates between the first extendable support element and the second member to limit a first maximum height the first extendable support element is permitted to extend the at least one first member away from the second member; the second vertical constraint is associated with the second extendable support element, and the second vertical constraint cooperates between the second extendable support element and the second member to limit a second maximum height that the second extendable support element is permitted to extend the at least one first member away from the second member; and wherein the first vertical constraint and the second vertical constraint are configured such that the first maximum height is different than the second maximum height.