1. A spinal stabilization device comprising: a centering rod having a first end, a second end and a flexible section connecting the first end and the second end; a deflectable rod including a retainer; a first bore extending along a longitudinal axis of the deflectable rod and opening through the retainer opposite the deflectable rod, wherein the first end of the centering rod is received in the first bore; a housing extending from a threaded bone anchor; a socket within the housing, wherein the socket at least partially encloses the retainer to form a joint; a channel extending from the socket out of the housing, wherein the deflectable rod extends through the channel out of the housing; and a second bore in the housing extending from the socket opposite the channel, wherein the second end of the centering rod is received in the second bore; whereby deflection of the rod bends the flexible section of the centering rod and the centering rod exerts a restoring force to center the rod within the channel.
3. The spine stabilization device of claim 1 , wherein said deflectable rod and said retainer are made in one piece.