12. A method of correcting a spinal deformity of a patient's spinal column, the method comprising: securing a first rod anchor to a first vertebra of the patient's spine; securing a second rod anchor to a second vertebra of the patient's spine; coupling a first rod to the first rod anchor and the second rod anchor such that: the first rod is laterally constrained relative to the first rod anchor while being free to slide axially and to change in alignment relative to the first rod anchor; and the first rod is laterally constrained relative to the second rod anchor while being free to slide axially and to change in alignment relative to the second rod anchor; securing a third rod anchor to a third vertebra of the patient's spine, the third vertebra being different from the first vertebra; securing a fourth rod anchor to a fourth vertebra of the patient's spine, the fourth vertebra being different from the second vertebra; coupling a second rod to the third rod anchor and the fourth rod anchor such that: the second rod is laterally constrained relative to the third rod anchor while being free to slide axially and to change in alignment relative to the third rod anchor; and the second rod is laterally constrained relative to the fourth rod anchor while being free to slide axially and to change in alignment relative to the fourth rod anchor; and coupling the first rod with the second rod such that the coupling facilitates derotation and translation of the spinal deformity.
12. A method of correcting a spinal deformity of a patient's spinal column, the method comprising: securing a first rod anchor to a first vertebra of the patient's spine; securing a second rod anchor to a second vertebra of the patient's spine; coupling a first rod to the first rod anchor and the second rod anchor such that: the first rod is laterally constrained relative to the first rod anchor while being free to slide axially and to change in alignment relative to the first rod anchor; and the first rod is laterally constrained relative to the second rod anchor while being free to slide axially and to change in alignment relative to the second rod anchor; securing a third rod anchor to a third vertebra of the patient's spine, the third vertebra being different from the first vertebra; securing a fourth rod anchor to a fourth vertebra of the patient's spine, the fourth vertebra being different from the second vertebra; coupling a second rod to the third rod anchor and the fourth rod anchor such that: the second rod is laterally constrained relative to the third rod anchor while being free to slide axially and to change in alignment relative to the third rod anchor; and the second rod is laterally constrained relative to the fourth rod anchor while being free to slide axially and to change in alignment relative to the fourth rod anchor; and coupling the first rod with the second rod such that the coupling facilitates derotation and translation of the spinal deformity. 15. The method of claim 12 , wherein a change in alignment comprises a change in one or more of pitch, yaw, and roll.