20. The spinal implant of claim 11 , wherein the compliant member is a polymer bushing.
11. A dynamic bone screw adapted for use in spinal stabilization for a spine comprising: an elongated bone anchor having, a longitudinal axis, a threaded distal end and a proximal end; a post having a longitudinal post axis, a distal end and a proximal end; a joint which secures the distal end of the post to the proximal end of the bone anchor such that the post can pivot relative to the bone anchor; a tubular extension of the bone anchor which extends over a distal portion of the post; the tubular extension having an external surface with a plurality of surface features adapted to engage a device mounted on the external surface to prevent rotation of the device relative to the bone anchor; and a compliant member disposed between a proximal portion of the post and the tubular extension of the bone anchor whereby the compliant member biases the longitudinal post axis of the post into alignment with the longitudinal axis of the elongated bone anchor, said compliant member is adapted to align the longitudinal post axis of the post with the longitudinal axis of the bone screw as the spine applies a load on the dynamic bone screw for spinal stabilization.