A self-actuating growing rod systems for the correction of orthopedic deformities. The system comprises at least one static rod, at least one growth rod, at least one sealing component, at least one fluid reservoir, at least one injection port and at least one pressure compensating mechanism which is adapted to cause net elongation of the growth rod. The system of the present disclosure is implanted onto the bony anatomy after bringing the deformed bony anatomy to the expected position. The system of the present disclosure is then surgically implanted onto the corrected bony anatomy. As growth occurs, the system of the present disclosure distracts； thereby enabling growth and maintaining the deformity correction.
