 Second part is to assess the reproducibility of the 3dimensional reconstructions whether they are made by a radiology technician, or by a so-called expert through collecting datas from 3 centers of pediatric surgery where EOS Imaging system is daily used to get spine or lower limb X-Rays. The investigators will include 20 children, divided as follow: six typically developing ones control X-Rays or lower limb standing X-ray required for a medical reason not interfering with torsional or longitudinal axis of the limb, 6 non-typically developing by example children who underwent a lower limb fracture, 6 cerebral palsy ones, and 2 children with extreme lower limb deformities. Reconstructions will be done twice in each center: once by a qualified operator, senior orthopedic surgeon, who followed a practical course, and once by a radiology technician, also used to the software. 