Anchors for spinal fixation and correcting spinal deformity

A spinal fixation anchor assembly for use with a spinal fixation rod, comprising:

• a bone anchor having a first longitudinal axis and comprising an anchor portion and post having a plurality of vertical splines,
• a connector that is adjustable relative to said bone anchor in each of axial, coronal, and sagittal directions, wherein the connector assembly has a base configured to couple to the bone anchor post, a receiver configured seat the spinal fixation rod, and a translation member, the base having a bore therethough, the bore having a second longitudinal axis that is parallel to the first longitudinal axis and a plurality of vertical splines arranged around at least a portion of the bore, the receiver having a rod passage opening in a top surface of the receiver and having a third longitudinal axis, the third longitudinal axis being transverse to the first longitudinal axis and second longitudinal axis, the translation member being situated in a cavity of the base and movable from a first position to a second position, wherein movement of the translation member to the second position locks said connector assembly in position relative to said bone anchor.