The invention relates to a method of creating a curvilinear cavity within a vertebral body or other body structure. The invention also relates to devices that may be used to perform the steps to create the curvilinear cavity. One such device is a curved drill including a spring assembly that controls the curvature of the drill. The spring assembly can cooperate with a feed screw to assist in curving the drill. The curved drill can be provided through a cannula.
