A pedicle screw assembly (100, 200), comprising: a bone fastener (170, 270) having a head (171, 271) at a proximal end (173, 273) and a threaded portion (172, 272) extending between the proximal end (173, 273) and a distal end (174, 274); a compression member (130, 230) having a cylindrical outer surface (134, 234) and a conical inner surface (131, 231); a locking member (140, 240) having an outer surface (142, 242) adapted to mate with the conical inner surface (141, 241) of the compression member (130, 230), wherein the outer surface (142, 242) of the locking member (140, 240) has a proximal portion (143, 243) and a distal portion (144, 244), the proximal portion (143, 243) being conically shaped and further comprising at least one of a circumferential groove and a circumferential flange, the locking member (140, 240) having a top edge and a bottom edge, the locking member (140, 240) being deformable and having a proximal portion (143, 243) further comprising a plurality of vertical slots (146, 246), the slots (146, 246) extending from the outer surface (142, 242) to the inner surface (141, 241) and from a top of the proximal portion (143, 243) down to at least one of the circumferential groove and the circumferential flange in the distal portion (144, 244), the slots (146, 246) being disposed around an outer circumference (142, 242) of the proximal portion (143, 243); and a receiving housing (150, 250) having a central bore (151, 251) extending from a proximal end (152, 252) to a distal end (153, 253), wherein the distal end (153, 253) comprises a first opening (154, 254) sized to receive the head (171, 271) of the bone fastener (170, 270) and the proximal end (152, 252) comprises a second opening (155, 255) sized to receive the locking member (140, 240) and the compression member (130, 230), wherein the receiving housing (150, 250) further comprises an intermediate portion (157, 257) extending between the proximal end (152, 252) and the distal end (153, 253), and wherein the intermediate portion (157, 257) further comprises a retention mechanism (159, 259) extending from the intermediate portion (157, 257) of the receiving housing (150, 250) inwardly towards the central bore (151, 251); wherein the compression member (130, 230) is positioned below the retention mechanism (159, 259) and the retention mechanism (159, 259) inhibits the compression member (130, 230) from moving above the retention mechanism (159, 259). a bone fastener (170, 270) having a head (171, 271) at a proximal end (173, 273) and a threaded portion (172, 272) extending between the proximal end (173, 273) and a distal end (174, 274); a compression member (130, 230) having a cylindrical outer surface (134, 234) and a conical inner surface (131, 231); a locking member (140, 240) having an outer surface (142, 242) adapted to mate with the conical inner surface (141, 241) of the compression member (130, 230), wherein the outer surface (142, 242) of the locking member (140, 240) has a proximal portion (143, 243) and a distal portion (144, 244), the proximal portion (143, 243) being conically shaped and further comprising at least one of a circumferential groove and a circumferential flange, the locking member (140, 240) having a top edge and a bottom edge, the locking member (140, 240) being deformable and having a proximal portion (143, 243) further comprising a plurality of vertical slots (146, 246), the slots (146, 246) extending from the outer surface (142, 242) to the inner surface (141, 241) and from a top of the proximal portion (143, 243) down to at least one of the circumferential groove and the circumferential flange in the distal portion (144, 244), the slots (146, 246) being disposed around an outer circumference (142, 242) of the proximal portion (143, 243); and a receiving housing (150, 250) having a central bore (151, 251) extending from a proximal end (152, 252) to a distal end (153, 253), wherein the distal end (153, 253) comprises a first opening (154, 254) sized to receive the head (171, 271) of the bone fastener (170, 270) and the proximal end (152, 252) comprises a second opening (155, 255) sized to receive the locking member (140, 240) and the compression member (130, 230), wherein the receiving housing (150, 250) further comprises an intermediate portion (157, 257) extending between the proximal end (152, 252) and the distal end (153, 253), and wherein the intermediate portion (157, 257) further comprises a retention mechanism (159, 259) extending from the intermediate portion (157, 257) of the receiving housing (150, 250) inwardly towards the central bore (151, 251); wherein the compression member (130, 230) is positioned below the retention mechanism (159, 259) and the retention mechanism (159, 259) inhibits the compression member (130, 230) from moving above the retention mechanism (159, 259).