Abstract: A method for treating scoliosis in a patient is disclosed. The method comprises identifying a spinal column having a lateral convex curve; providing a first anchor, a second anchor, and a tether; securing the first anchor to a posterior region of a first vertebra; securing the second anchor to a posterior region of a second vertebra; securing a first tether end at a first tether connection location; and securing a second tether end at a second tether connection location. A scoliosis treatment system comprises anchors, each having a tether connection location positioned at a first location offset in a first lateral direction from a midsagittal plane of the first or second vertebra, and the anchors do not include any tether connection locations offset in in a second lateral direction, opposite the first lateral direction, from the midsagittal plane of the first vertebra or second vertebra.