An expandable stabilization device is disclosed that is suitable for deployment within cancellous bone, including, for example, within a vertebral body of a spine. The device comprises: an elongate expandable shaft adapted to be positioned within a vertebral body having a first profile and a second profile wherein the shaft is adapted to cut through cancellous bone within the vertebral body during expansion from the first profile to the second profile and further wherein the shaft is adapted to abut a surface of cortical bone within the vertebral body without passing therethrough. The invention also includes a method for treating cancellous bone, such as cancellous bone of a vertebral body. The method comprises: delivering an expandable device within the cancellous bone of in an interior of a vertebral body expanding the delivered device within the cancellous bone of the vertebra body applying force from a surface of the device to an inner surface of a cancellous bone of the vertebral body sufficient to cut through the cancellous bone and applying force from a surface of the device to an inner surface of a cortical bone of the vertebral body sufficient to support the vertebral body
