An expandable bone device including first and second bone support elements, a manipulator positioned between the first and second bone support elements and connected to them by link members, the manipulator adapted to move the first and second bone support elements between a collapsed orientation and an expanded orientation, wherein in the collapsed orientation the first and second bone support elements are drawn towards the manipulator and in the expanded orientation the first and second bone support elements are moved outwards away from a longitudinal axis of the manipulator, and deformable support struts connected between the manipulator and the first and second bone support elements that deform when moved by the manipulator from the collapsed orientation to the expanded orientation and vice versa, wherein in the expanded orientation the deformable support struts form a structure that maintains the first and second bone support elements in the expanded orientation.