SPINAL FIXATION DEVICE WITH INTERNAL DRIVE STRUCTURE

摘要

A bone screw arrangement (10) including a retainer (12) and an anchor (14). The retainer includes a first receiving region configured for receipt of a connecting rod (50), and a second receiving region configured for receipt of the anchor. The second receiving region includes an upper socket and a lower socket. The arrangement includes an interface (15) that transfers torque applied to the retainer, to the anchor for securing the anchor to a bone element.