1. A surgical tool for implanting a dynamic bone anchor having a deflectable post extending from a housing at a proximal end of the dynamic bone anchor, the surgical tool comprising: an elongate shaft having, at a distal end, a head adapted to engage the dynamic bone anchor; the head having a socket adapted to engage the housing of the dynamic bone anchor; the head further including a retainer adapted to engage the deflectable post to retain the deflectable post within the socket; the elongate shaft further having at the proximal end a handle for turning the shaft in order to turn the housing of the dynamic bone anchor to implant the dynamic bone anchor in a vertebra; and the elongate shaft further having adjacent the handle an actuator to cause the retainer to release the deflectable post after implantation of the bone anchor in the vertebra.
1. A surgical tool for implanting a dynamic bone anchor having a deflectable post extending from a housing at a proximal end of the dynamic bone anchor, the surgical tool comprising: an elongate shaft having, at a distal end, a head adapted to engage the dynamic bone anchor; the head having a socket adapted to engage the housing of the dynamic bone anchor; the head further including a retainer adapted to engage the deflectable post to retain the deflectable post within the socket; the elongate shaft further having at the proximal end a handle for turning the shaft in order to turn the housing of the dynamic bone anchor to implant the dynamic bone anchor in a vertebra; and the elongate shaft further having adjacent the handle an actuator to cause the retainer to release the deflectable post after implantation of the bone anchor in the vertebra. 7. The surgical tool of claim 1 , wherein the elongate shaft is free to rotate relative to the elongate tube.