does so by providing controlled resistance to spinal motion particularly around neutral posture in the region of neutral zone as the spine bends forward flexion the stabilization device 10 is tensioned see fig3 d and when the spine bends backward extension the stabilization device 10 is compressed see fig3 e the resistance to displacement provided by the dynamic spine stabilization device 10 is non linear being greatest in its central zone so as to correspond to the individual 39 s neutral zone that is the central zone of the stabilization device 10 provides a high level of mechanical assistance in supporting the spine as the individual moves beyond the neutral zone the increase in resistance decreases to a more moderate level as a result the individual encounters greater resistance to movement or greater incremental resistance while moving within the neutral zone the central zone of the dynamic spine stabilization device 10 that is the range of motion in which the spine stabilization device 10 provides the greatest resistance to movement may be adjustable at the time of surgery to suit the neutral zone of each individual patient in such exemplary embodiments the resistance to movement provided by the dynamic spine stabilization device 10 is adjustable pre operatively and intra operatively this helps to tailor the mechanical properties of the dynamic spine stabilization device 10 to suit the compromised spine of the individual patient the length of the dynamic spine stabilization device 10 may also be adjustable intra operatively to suit individual patient anatomy and to achieve desired spinal posture the dynamic spine stabilization device 10 can be re adjusted post operatively with a surgical procedure to adjust its central zone to accommodate a patient 39 s altered needs according to exemplary embodiments of the.