Curve type Type  Proximal thoracic Main thoracic Thoracolumbar/lumbar Description 1 Nonstructural Structural (major) Nonstructural Main thoracic (MT) 2 Structural Structural (major) Nonstructural Double thoracic (MT) 3 Nonstructural Structural (major) Structural Double major (DM) 4 Structural Structural (major) Structural (major) Triple major (TM)§ 5 Nonstructural Nonstructural Structural (major) Thoracolumbar/lum bar (TL/L) 6 Nonstructural Structural Structural (major) Thoracolumbar/lum bar-main thoracic (TL/L-MT)

Table 1: The Lenke classification system of adolescent idiopathic scoliosis [6].

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