A steerable cannula assembly for use in vertebral body augmentation comprises an outer cannula having a central lumen extending through it, and having an articulating portion that curves in response to a force applied to a proximal end of the outer cannula. An inner cannula has a central lumen extending through it, the inner cannula being sized and configured to extend into a portion of the central lumen of the outer cannula, and coupled to a distal end of the outer cannula. The cannula can be used to create a void within a vertebral body and may also be used to control delivery of a treatment element to the body.
