A spinal fixation system (1) for use in the fixation of a spine having a securing element (18) having a biasing member (21) located on a lower portion (44) of the securing element (18) and a substantially concave surface (25) dimensioned for at least partially circumscribing a fixation rod (15) and a retaining element (22) having: a substantially concave top surface (23) dimensioned for at least partially circumscribing a fixation rod (15) an outwardly extending wing (16) a crimping portion (42), wherein the crimping portion (42) at least partially compresses when a force is exerted on the retaining element (22) and a substantially concave bottom surface (24) dimensioned for at least partially circumscribing a head (11) of a bone fixation element (9).
