no participants enrolled

Low bone mineral density affects 77% of children with severe cerebral palsy (GMFCS IV & V) with an increased fracture risk of 4%. One strategy supposed to improve bone mineral density is verticalisation with static devices. Nowadays there is no time recommendation of verticalisation however high intensity verticalisation has been shown to be effective in improving bone mineral density in childrens with cerebral palsy, but difficult to apply in real life due to lack of qualified therapists, device's complexity, and severe impairment in those children. The investigators aim to compare bone mineral density and bone remodelling factors of verticalized and non verticalized childrens with severe cerebral palsy as achieved in everyday life. The investigators conduced a retrospective study comparing bone mineral density and factors who influence bone remolling in severe cerebral palsy's according to whether they are verticalized or not.

Inclusion Criteria:

• patients with cerebral palsy GMFCS (gross motor functional classification scale) IV-V
• age of patients 3-18 years

Exclusion Criteria:

• patients with neuro muscular disease
• patient age < 3 years old and > 18 years old
• patient with constitutionnal bone disease
• patient with growth hormone treatment
• patient with surgery < 6 months
• patient with fracture <3 months
• Refusal of the legal representative

Children whom age is between 3 and 18 years old. Children with cerebral palsy GMFCS (gross motor functionnal classification scale) IV-V.