An expandable implant (510, 610), comprising: a top support assembly (518, 618) defining an upper surface configured to engage a first portion of vertebral bone; a bottom support assembly (520, 620) defining a lower surface configured to engage a second portion of vertebral bone; a control assembly (516, 616) 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 (522, 624) extends at an acute angle relative to a portion of the lower surface (542, 640); wherein the control assembly includes a first wedge member (514, 614) movably coupled to a second wedge member (512, 612) 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 (516, 616) 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 (518, 618) defining an upper surface configured to engage a first portion of vertebral bone; a bottom support assembly (520, 620) defining a lower surface configured to engage a second portion of vertebral bone; a control assembly (516, 616) 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 (522, 624) extends at an acute angle relative to a portion of the lower surface (542, 640); wherein the control assembly includes a first wedge member (514, 614) movably coupled to a second wedge member (512, 612) 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 (516, 616) 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.