An instrument, and method for using the same, for treating and repairing a vertebral body, which includes a steerable shaft and a distal end portion. The steerable shaft defines a longitudinal axis and includes a proximate portion and a flexible portion along the length. The distal end portion extends from the steerable shaft with an initial diameter, in the collapsed state, and has one or more expanded diameters. After inserting the instrument into the vertebral body, the flexible portion permits the distal end portion of the steerable shaft to be steered away from the longitudinal axis toward a center region within the vertebral body. A cutting surface upon the distal end portion is used to ream cancellous bone within the vertebral body and to create a single void which is off-set form the initial access axis.