An orthopedic fixation device comprising: a coupling element (310; 510) having a bore extending therethrough, an interior surface disposed about the bore ; - a bone fastener , wherein the bone fastener comprises a head and an extension that extends from the head , wherein the head is configured for loading into the coupling element (310; 510) through the bottom of the bore ; - a locking cap assembly , wherein the locking clamp assembly comprises: - a body having a bore extending through the body and a pair of tabs extending from opposite sides of the body , wherein the bore includes a threaded portion, and wherein a radially outermost surface of each tab includes a flat portion ; and - a set screw extending through the bore of the body and having threads corresponding to the threaded portion of the bore of the body ; - a saddle (306; 406; 506;) having a bore extending through the saddle (306; 406; 506;), wherein the saddle (306; 406; 506;) includes a lower portion sized and shaped to receive at least a portion of the head of the bone fastener ; characterized in that - the coupling element (310; 510) has an annular channel (316; 516) formed in a distal portion of the interior surface and the fixation device further comprises - a retaining clip disposed below the fastener in the annular channel of the coupling element (310; 510), wherein an inner diameter of the retaining clip is less than a maximum diameter of the head of the bone fastener - wherein the retaining clip has an upper and a lower surface including a plurality of hills and valleys to advantageously lock the retaining clip in place and prevent it from moving within the coupling element . - a bone fastener , wherein the bone fastener comprises a head and an extension that extends from the head , wherein the head is configured for loading into the coupling element (310; 510) through the bottom of the bore ; - a locking cap assembly , wherein the locking clamp assembly comprises: - a body having a bore extending through the body and a pair of tabs extending from opposite sides of the body , wherein the bore includes a threaded portion, and wherein a radially outermost surface of each tab includes a flat portion ; and - a set screw extending through the bore of the body and having threads corresponding to the threaded portion of the bore of the body ; - a saddle (306; 406; 506;) having a bore extending through the saddle (306; 406; 506;), wherein the saddle (306; 406; 506;) includes a lower portion sized and shaped to receive at least a portion of the head of the bone fastener ; characterized in that - the coupling element (310; 510) has an annular channel (316; 516) formed in a distal portion of the interior surface and the fixation device further comprises - a retaining clip disposed below the fastener in the annular channel of the coupling element (310; 510), wherein an inner diameter of the retaining clip is less than a maximum diameter of the head of the bone fastener - wherein the retaining clip has an upper and a lower surface including a plurality of hills and valleys to advantageously lock the retaining clip in place and prevent it from moving within the coupling element . <EOS>