An expandable implant includes a top support assembly defining an upper surface configured to engage a first portion of bone, a first central aperture extending from the upper surface to an interior of the implant, and a first grid structure surrounding the first central aperture； a bottom support assembly defining a lower surface configured to engage a second portion of bone, a second central aperture extending from the lower surface to the interior, and a second grid structure surrounding the second central aperture； and 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.
