Cerebral palsy is the leading cause of motor disability in children. Children with little or no walking (GMFCS III, IV and V) represent 43% of children with cerebral palsy, the majority of whom present pelvic and spinal deformities in the frontal and sagittal planes. However, sagittal pelvic spinal statics have been little studied, especially in the sitting position, which is the functional position of these children.

Moreover, there are currently no recommendations on how to perform follow-up radiographs of the spine in children who do not walk much.

A better understanding of pelvic and sagittal spinal statics would help prevent deformities and their complications.

Standardizing the method of performing pelvic-spinal radiographs in the sitting position will make monitoring of spinal statics more reliable.

Inclusion Criteria:

• Child or adolescent aged 4 to 17 years
• Child or adolescent with cerebral palsy GMFCS III, IV or V
• Child or adolescent whose parents, or the child if possible, have given free, informed and written consent
• Child or adolescent affiliated or beneficiary of a health insurance plan

Exclusion Criteria:

• Child or adolescent with history of spinal surgery
• Child or adolescent with parents unable to give consent
• Child or adolescent participating in a therapeutic research study (RIPH 1 or drug study)
• Child or adolescent in an exclusion period determined by another study
• Child or adolescent under court protection, guardianship or curatorship
• Pregnant, parturient or breastfeeding patient

Children and adolescents from 4 to 17 years old with cerebral palsy GMFCS III, IV or V followed in the Physical Medicine and Rehabilitation Department, Children Rehabilitation Unit of the CHU of Nîmes