Method for producing a rod (TV) that has a curvature for a vertebral osteosynthesis team designed to correct a patient's spine (CV), where the method comprises the following stages: a) take a preoperative sagittal radiograph (RS) of the spine (CV) of the patient to be treated, extending from the cervical vertebrae to the femoral heads； b) in said radiography (RS), identify: the straight points and segments that make it possible to calculate the so-called "pelvic" parameters, that is, the sacral slope (SS), the pelvic version (PV) and the pelvic incidence (PI) , the center of the saucer of the first vertebra of the sacrum, called S1； the center of the second vertebra of the sacrum, called S2； the center of the lower plate of a reference dorsal vertebra, in particular, the twelfth dorsal vertebra, called T12； the center of the lower saucer of a cervical vertebra of reference, in particular, the seventh cervical vertebra, called C7； c) represent, on the radiograph (RS), a first curved segment (SC1) that begins at the center of the S1 plate, tangent to the segment that goes from the center of S2 to the center of the plate of S1, which crosses the centers of the bodies of the vertebrae of segment L5-L1 and ending in the center of the lower plate of said reference dorsal vertebra； d) represent, on the radiograph (RS), a second curved segment (SC2) tangent to the first curved segment (SC1) in the center of the lower plate of said reference dorsal vertebra (T12), which crosses the centers of the bodies of the vertebrae of the segment that extends between said reference dorsal vertebra and said cervical reference vertebra and that goes to the center of the lower saucer of said reference cervical vertebra (C7)； e) identify, in said radiography (RS), the correction or corrections (01.02) to be made to the spine (CV)； f) rotate parts (P1, P2) of said radiography (RS) with respect to other parts of said radiography (RS), based on the corrections (01, 02) to be made, to show the
