Inclusion Criteria:  diagnosis of idiopathic scoliosis, carried out by the Physician with the Adams test and the scoliometer; age between 8 and 16 years, both sexes; ability to perform the self-elongation movement; amplitude of the major scoliotic curve <40 degrees Cobb; scheduled annual follow-up which requires a radiograph.  Exclusion Criteria:  secondary scoliosis; obesity; orthopedic pathologies that modify the plantar supports; pathologies that modify balance (neurological and / or vestibular); inability to understand and sign informed consent / assent.