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1. A kit for a dynamic stabilization system comprising:
a plurality of head portions which form a modular pedicle screw, each said head portion including a cylindrical wall with diametrically opposed grooves that extend downwards from the top of said cylindrical wall, said grooves are sized and configured to receive said rod within said diametrically opposed grooves, and a lock screw configured to engage threads formed on an inner surface of said cylindrical wall thereby securing a rod to said head portion, said head portions including a first channel formed coincident with its longitudinal axis and open at the top and the bottom of the head portion, and a first coupling element connected to each of said head portion, said kit further including a plurality of intermediate portions having the same or varying geometries or rigidities, said intermediate portions each including an elastic portion and an upper coupling member and a lower coupling member, said elastic and said upper and lower coupling being fixedly connected, each of said plurality of intermediate portions including a second channel extending coincident with its longitudinal axis and open at the top and bottom of said intermediate member, wherein said elastic portion is generally cylindrical in shape and wherein the elastic portion further includes a jacket that surrounds the outer surfaces of said cylindrical elastic or rigid portion and extends outwardly from the top and bottom ends of the cylinder, the jacket portion extending outward from the top of the cylinder is affixed into tabs located in the upper coupling member and the jacket portion extending outward from the bottom of the cylinder is affixed into tabs formed in the lower coupling member, thereby completing the assembling of the intermediate portion, said kit also including a plurality of said threaded shank portions having the same or varying lengths, each including a threaded and tapered outer surface and a second coupling member formed at one end thereof, each said threaded shank portions and each of said second coupling members each having a third channel formed coincident with the longitudinal axis of each of said threaded shank portions and open at the top and bottom of each of said threaded shank portions, said first, second, and third channels are configured to be in alignment with one another, whereby a wire can pass freely from the open bottom end of the threaded shank portion, through the intermediate portion, and out the open top end of the head portion and be completely removed from the pedicle screw.
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