A device is disclosed for securing a spinal rod to the spine comprising a fastener having a curvate head portion, a securement body having an interior cavity including a first portion having a first axis and configured to accommodate the curvate head portion of the fastener and a second portion having a second axis and configured to accommodate a spinal rod in such a manner so that the spinal rod and the curvate head portion are in contact with one another, and a locking member configured to linearly engage the second portion of the interior cavity of the securement body along the axis thereof in such a manner so as to secure the relative position of the spinal rod and the head portion of the fastener.