Table I.

AEBI classification of adult scoliosis

Type 1: Primary degenerative scoliosis (de novo scoliosis)

Type 2: Progressive idiopathic scoliosis of the lumbar and/or thoracolumbar spine

Type 3a: Secondary adult scoliosis (for example: adjacent thoracic or thoracolumbar curve of idiopathic, neuromuscular or congenital origin)

Type 3b: Deformity progressing mostly due to bone weakness with, e.g., osteoporotic fracture with secondary deformity

Aebi classification system used to classify adult scoliosis.