Inclusion Criteria:  Inclusion criteria for "sick" patients:  Presence of idiopathic scoliosis, diagnosed by a clinical examination by an orthopedic doctor and confirmed by the presence of a Cobb angle greater than 10 ° on radiographs of the spine Signed informed consent Affiliation to a social security scheme or beneficiary of such a scheme  Inclusion criteria for "healthy relatives":  Be related to the first or second degree with at least 2 individuals suffering from idiopathic scoliosis, and whose family tree over 3 generations finds at least 3 cases of idiopathic scoliosis Do not present with scoliosis (clinical examination by an orthopedic doctor and x-rays of the spine). Affiliation to a social security scheme or beneficiary of such a scheme  Exclusion Criteria:  Non-inclusion criteria for "sick" patients:  Be part of one of the following categories of vulnerable people: protected adults, adults unable to express their consent and not subject to a protection measure, pregnant women, parturients and nursing mothers, people deprived of their liberty, people hospitalized without consent, people admitted to a health or social establishment for purposes other than research Suspicion of scoliosis secondary to clinical examination  Non-inclusion criteria for "healthy relatives":  Be part of one of the following categories of vulnerable people: protected adults, adults unable to express their consent and not subject to a protection measure, pregnant women, parturients and nursing mothers, people deprived of their liberty, people hospitalized without consent, people admitted to a health or social establishment for purposes other than research Discovery of scoliosis during research (if scoliosis of an idiopathic nature: patient included in the cohort of patients, if secondary scoliosis: exclusion from the family).  All patients :  Pregnancy in progress or desired with discontinuation of contraception (contraindication to the realization of x-rays).