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Objective The objective of this study is to evaluate leg length discrepancy in adolescent idiopathic scoliosis.  Methods A retrospective study of 80 subjects with adolescent idiopathic scoliosis (AIS) was conducted. The inclusion criteria were patients aged 10 to 18 years old with posteroanterior (PA) and lateral full-length radiographs. The exclusion criteria were patients subjected to surgery or orthotic treatment, those with other spinal disease, and those with poor quality x-rays. The parameters evaluated were: age, sex, Risser stage (RS), triradiate cartilage (TC), scoliotic curvatures, differentiated according to Lenke classification, sagittal (SB) and coronal balance (CB), and leg length discrepancy, which was assessed through the difference between the femoral heads (LLD) and through the assessment of pelvic obliquity (PO).  Results The majority of patients with AIS demonstrated a mild LLD (&lt;1 cm). The mean LLD was significantly different (p&lt;0.01) between the scoliotic population with a main thoracolumbar curvature and those with a main lumbar curvature. When there was an LLD, it was the left limb that was shortened in most cases. The side of the longer lower limb had a direct influence on the CB (p=0.052).  Conclusions This study demonstrates that in an AIS population with small LLD values, the extent of the shortening has a stronger impact on coronal balance and location than on the dimension of the main scoliotic curvature. These results demonstrate the importance of a more in-depth study on the effects of LLD &lt;1 cm in the development of AIS and coronal imbalance. Level of evidence IV; Case Series.

LEG LENGTH DISCREPANCY IN ADOLESCENT IDIOPATHIC SCOLIOSIS