This invention is a spinal fixation system. The spinal fixation systemhas a set of screw clamp assemblies (10) adapted for attachment of a rod(12). The spinal fixation system comprises anchor screws (50), and clamps(70, 90). The anchor screws (50) include a shoulder (54) width "y" thatvaries within the anchor screws (50) in the set to seat a clamp (70, 90)at a desired distance above the plane of the spine into which the anchorscrews (50) are implanted. The clamps (70, 90) include an arm length "x"that varies within the clamps in the set to attach the rod (12) at a desireddistance from the clamp seat site and apertures for receiving the rod withinthe clamps, wherein the apertures are set at an angle "a" from a planeperpendicular to the long axis of the anchor screw when a clamp (70, 90)is seated on the anchor screw (50) that varies within the clamps in the set.
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