An expandable implant , comprising: a top support assembly defining an upper surface configured to engage a first portion of vertebral bone; a bottom support assembly defining a lower surface configured to engage a second portion of vertebral bone; a control assembly coupled to the top support assembly and the bottom support assembly and configured to control relative movement between the top support assembly and the bottom support assembly between a collapsed position and an expanded position; wherein in the collapsed position, the upper surface is generally parallel to the lower surface, and wherein in the expanded position, a portion of the upper surface extends at an acute angle relative to a portion of the lower surface ; wherein the control assembly includes a first wedge member movably coupled to a second wedge member such that relative movement between the first wedge member and the second wedge member causes relative movement between the top support assembly and the bottom support assembly; wherein the control assembly includes a threaded control member wherein the control member movably couples the first wedge member and the second wedge member such that a first rotation of the control member causes the top support assembly to move away from the bottom support assembly, and a second further rotation of the control member causes the portion of the top support assembly to move in a non-linear fashion relative to the portion of the bottom support assembly; and wherein the control member rotates freely and is longitudinally fixed relative to the second wedge member, and threadingly engages and longitudinally translates relative to the first wedge member. a top support assembly defining an upper surface configured to engage a first portion of vertebral bone; a bottom support assembly defining a lower surface configured to engage a second portion of vertebral bone; a control assembly coupled to the top support assembly and the bottom support assembly and configured to control relative movement between the top support assembly and the bottom support assembly between a collapsed position and an expanded position; wherein in the collapsed position, the upper surface is generally parallel to the lower surface, and wherein in the expanded position, a portion of the upper surface extends at an acute angle relative to a portion of the lower surface ; wherein the control assembly includes a first wedge member movably coupled to a second wedge member such that relative movement between the first wedge member and the second wedge member causes relative movement between the top support assembly and the bottom support assembly; wherein the control assembly includes a threaded control member wherein the control member movably couples the first wedge member and the second wedge member such that a first rotation of the control member causes the top support assembly to move away from the bottom support assembly, and a second further rotation of the control member causes the portion of the top support assembly to move in a non-linear fashion relative to the portion of the bottom support assembly; and wherein the control member rotates freely and is longitudinally fixed relative to the second wedge member, and threadingly engages and longitudinally translates relative to the first wedge member. <EOS>