“…1,13 Age and the level of motor impairment are the principal determinants of the appearance of the deformity, reaching values from 88 to 100% in the thoracic level, 72 to 81% in the upper lumbar level, 3% in the lower lumbar level, and 9% in the sacral level. 2,3,14 Pelvic obliquity is often related to spinal deformities and is attributed to muscle contractions above and below the pelvis, as well as to intrinsic deformities of the pelvic bones due to growth disturbances. 4 The objectives of spinal arthrodesis surgery are the correction of the deformity and the restoration of the balance between the trunk and pelvis, thus influencing the improvement in the quality of life of these patients.…”