Transverse-plane foot deformities are a frequently encountered issue in children with neurological disorders. They are the source of many symptoms, such as pain and walking difficulties, making their prevention very important. It is thus important to prevent the occurrence of transverse-plane foot deformities and limit their development regarding the high risk of morbidity. In order to prevent such deformities, in the department of pediatric physical medicine and rehabilitation department of Lyon, since 2001 the investigator use a side pole static ankle foot orthosis (SPS AFO) in children with a neurological disorder predisposing such deformities. The aim of the study this study is to describe the use, tolerability and potential side effects of this orthosis in children with neurological disorders from the investigator's department