9. An adaptive spinal rod adapted to stabilize a spine, wherein the spinal rod comprises: an elongated rod having a first end, a second end, and a longitudinal rod axis; a housing at the first end of the rod; a rod aperture passing through the housing; a race within the rod aperture; a mount contained by the race and movable relative to the race, the mount can rotate and pivot within the rod aperture, wherein the mount has a central axis perpendicular to a base side of the mount; an elongated slot passing through the mount and said elongated slot adapted to receive a post, wherein the elongated slot has a first dimension perpendicular to the central axis of the mount and a second dimension parallel to the central axis of the mount, and wherein the post is loosely coupled to the elongated slot such that the post can slide in the first dimension and the second dimension of the elongated slot, and rotate in the elongated slot.
9. An adaptive spinal rod adapted to stabilize a spine, wherein the spinal rod comprises: an elongated rod having a first end, a second end, and a longitudinal rod axis; a housing at the first end of the rod; a rod aperture passing through the housing; a race within the rod aperture; a mount contained by the race and movable relative to the race, the mount can rotate and pivot within the rod aperture, wherein the mount has a central axis perpendicular to a base side of the mount; an elongated slot passing through the mount and said elongated slot adapted to receive a post, wherein the elongated slot has a first dimension perpendicular to the central axis of the mount and a second dimension parallel to the central axis of the mount, and wherein the post is loosely coupled to the elongated slot such that the post can slide in the first dimension and the second dimension of the elongated slot, and rotate in the elongated slot. 14. The adaptive spinal rod of claim 9 wherein said aperture is elongated such that said mount can move linearly in said elongated aperture.