A spinal correction system for implantation in a patient, the system comprising: a correction anchor for being secured to a vertebra in a defect area of a spine; a stabilizing member for being secured against translation at the defect area of the spine; a reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) coupled to the stabilizing member, the reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) including: a piston unit displaceable in a first direction between a first position and a second position, the piston unit including a return mechanism for returning the piston unit from the second position to the first position; a transfer unit coupled to the piston unit such that displacement of the piston unit in the first direction causes the transfer unit to be displaced in a second direction; and a connector extending from the reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) to define an effective length between the reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) and the correction anchor, the connector having a first end coupled to the transfer unit and a second end for being coupled to the correction anchor such that displacement of the transfer unit causes shortening of the effective length of the connector; characterized by the piston unit including a depressible shaft and the transfer unit including a roller. a correction anchor for being secured to a vertebra in a defect area of a spine; a stabilizing member for being secured against translation at the defect area of the spine; a reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) coupled to the stabilizing member, the reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) including: a piston unit displaceable in a first direction between a first position and a second position, the piston unit including a return mechanism for returning the piston unit from the second position to the first position; a transfer unit coupled to the piston unit such that displacement of the piston unit in the first direction causes the transfer unit to be displaced in a second direction; and a connector extending from the reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) to define an effective length between the reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) and the correction anchor, the connector having a first end coupled to the transfer unit and a second end for being coupled to the correction anchor such that displacement of the transfer unit causes shortening of the effective length of the connector; a piston unit displaceable in a first direction between a first position and a second position, the piston unit including a return mechanism for returning the piston unit from the second position to the first position; a transfer unit coupled to the piston unit such that displacement of the piston unit in the first direction causes the transfer unit to be displaced in a second direction; and a connector extending from the reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) to define an effective length between the reciprocating adjuster (100, 150, 200, 250, 300, 350, 850, 900, 950, 1000) and the correction anchor, the connector having a first end coupled to the transfer unit and a second end for being coupled to the correction anchor such that displacement of the transfer unit causes shortening of the effective length of the connector; characterized by the piston unit including a depressible shaft and the transfer unit including a roller.