Lack of current consensus on the therapeutic management of low-grade osteo-ligament injuries in ankle trauma in children. Several types of immobilization are evaluated in the literature, with different conclusions. Some teams recommend a functional treatment similar to the adult (with or without strict immobilization), others remain on standard rigid immobilizations.~The goal of the study is to simplify and homogenize the therapeutic management of low-grade osteo-ligament injuries in ankle trauma in children.~CHEVIPED is a controlled, randomized, comparative monocentric trial.~Randomization into 2 groups and stratified on presence to fracture Salter 1 and age~Experimental group : Patients with below-knee soft resin cast Control group : Patients with below-knee rigid resin cast.~The primary objective is to demonstrate at 2 months that with post traumatic low- grade osteo-ligamentous ankle injury the recovery of physical function are at least as effective with a below-knee soft resin cast compared to a below-knee rigid resin cast.~The secondary objectives are :~Clinical evaluation of treatment at 3 weeks in immediate post-immobilization.~Evaluation of the management satisfaction (effectiveness and understanding) and the treatment tolerance .~Evaluation of the time taken to resume painless support after immobilization.~Point of interest evaluation~Determine the diagnostic performance of the combined clinical criteria in comparison with the ultrasound/radiography couple.~Evaluation of the diagnostic performance of clinical inspection criteria (edema, bruise) in high-grade ligament damage.~Evaluation of the link between the combined clinical criteria and the results of the radiography.~Evaluation of the relationship between combined clinical criteria and ultrasound results.~Evaluation of the link between the results of radiography and ultrasound.~200 patients are expected to be included.~Inclusion period : 12 months. Duration of patient's participation: 2 months Total study duration: 14 months.
Lack of current consensus on the therapeutic management of low-grade osteo-ligament injuries in ankle trauma in children. Several types of immobilization are evaluated in the literature, with different conclusions. Some teams recommend a functional treatment similar to the adult (with or without strict immobilization), others remain on standard rigid immobilizations.~The goal of the study is to simplify and homogenize the therapeutic management of low-grade osteo-ligament injuries in ankle trauma in children.