An anchoring system uniplanar bone (800) for a fixing method comprising: a fastener bone (804) including a Headlamp to (830) and a shaft (58) adapted to engage an anatomy, the head ( 830) having a first planar surface (56c) opposite a second flat surface (56d), at least one first bearing arc (56a, 56b) between the first and second (56c, 56d) flat surfaces and at least one first mating surface (830e, 830f) between the planar first and second surfaces (56c, 56d) and adjacent the at least one first bearing surface a supporting part (802) extending along a longitudinal axis (L) and having a first bore (812) receiving the head of the fastener of the bone (804), at least one engaging hole (38) defined transverse to the length axis (L) and in communication with the first bore (812) and a pair of side walls (44, 48) cooperating with flat surfaces (56c, 56d) of the head wherein a pressure cap (806) is received within the first bore (812) and having a second mating surface (842) contacts the at least one first engagement surface (842a) of the head (830) of the bone fastener (804) characterized in that a coupling system (16) including at least a first pin (54) having a second bearing surface (54a), the at least one first pin (54) received through at least one hole coupling (38) so that a longitudinal axis of at least a first pin (54) is perpendicular to a plane parallel to the first and second (56c, 56d) flat surfaces plane and the second bearing surface (54a) is contacting the at least one first bearing arc (56a, 56b) of the head (830) and wherein contact between the at least one first mating surface (830e, 830f) of the head (830) and at least one second coupling surface pressure cap (806) with the flat surfaces first and second (56c, 56d) cooperating with the corresponding side walls (44, 48) of the support part (802) allowing the fixing of the bone (804) to move relative to the workpiece support (802) in only one plane.Un sistema de anclaje de huesos uniplanar (800) para un
