This study evaluates in a prospectively collected multicenter cohort the existence, characteristics and determinants of EBPCA, the obtained results and their determinant, the rate of over- and under-treatment and their determinants.

Since an evidence-based personalised conservative approach (EBPCA) to Adolescent Idiopathic Scoliosis has never been checked, the investigators studied a prospectively collected multicenter cohort with the aim to verify in the different clinical situations 1) the existence, characteristics and determinants of EBPCA; 2) the obtained results and their determinant; 3) the rate of over- and under-treatment and their determinants. These results are expected to check the actual evidence in everyday clinic, to provide a benchmark for future studies, and to inform guidelines producers and consequently health policy in high income countries, but also and particularly in low-middle income countries where surgery is difficult due to the high costs, and missing competences and structures.

Inclusion Criteria:

• diagnosis of Adolescent Idiopathic Scoliosis (AIS),
• curves between 11 and 45° at start,
• Risser test between 0 and 2.
• Since our Institute receive many participants for a second opinion, we considered only participants in charge, defined as those who came at least three times to our facilities

Exclusion Criteria:

• previous bracing;
• absence of x-rays in the 3 months before/after the start and the end of treatment/observation.

Scoliotic patients that were referred to a tertiary clinic specialized on spine deformity.