17. The system of claim 1 wherein said deflection rod is tapered.
1. A dynamic spine stabilization system comprising: a first horizontal rod having a first end and a second end; a mount extending from the first horizontal rod midway between the first end and the second end; a first bone anchor connectable to the first end of the first horizontal rod and configured to engage a first pedicle of a first vertebra, and a second bone anchor connectable to the second end of the second horizontal rod and configured to engage a second pedicle of the first vertebra; a second horizontal rod having a third end and a fourth end; a third bone anchor connectable to the third end of the second horizontal rod and configured to engage a third pedicle of a second vertebra, and a fourth bone anchor connectable to the fourth end of the second horizontal rod and configured to engage a fourth pedicle of the second vertebra; a deflection rod connected to the mount of the first horizontal rod, the deflection rod having a fifth end extending away from the mount substantially parallel to the first horizontal rod; and a vertical rod connected between the fifth end of the deflection rod and the second horizontal rod, and a pivotable joint located where the vertical rod is connected to the fifth end of the deflection rod; such that, when secured between the first vertebra and second vertebra, the vertical rod transmits load from the second vertebra to the deflection rod; the deflection rod transmits load to the mount; the mount transmits load to the first horizontal rod; and the first horizontal rod distributes said load to the first pedicle and the second pedicle of the first vertebra via the first bone anchor and the second bone anchor.