A remotely controllable growing rod device comprises a housing containing on-board electronics and at least one drive assembly operable to move associated extension elements relative to each other. Each extension element terminates in an anchor element configured to be anchored to a part of the spine, such as the pedicle of a vertebral body. The on-board electronics includes a microprocessor, a power supply, such as an inductive power supply, and a receiver/transmitter. The microprocessor is configured to receive remotely transmitted movement data through the receiver and is further configured for feedback controlled actuation of the drive assembly for relative movement the associated extension elements to achieve a desired physiological condition of the patient's spine.