Ultrasound tool in bones trauma is underused in the emergency department of the University Hospital of Saint-Etienne. This prospective non randomized monocentric study will measure how much this non irradiant method of diagnostic is sensible and specific in long bones fractures, and will evaluate it advantages versus conventional X ray examination.

This study is based on physical examination (swelling, hematoma, edema) and concerns all long bones, including benign trauma (non deforming and closed fractures). The necessary time to make an ultrasound conclusion and the operator certitude degree will be measured.

Inclusion Criteria:

• Children with low kinetic, non-deforming, non-open long bone trauma

Exclusion Criteria:

• Opened fracture, deforming trauma

Children aged between 0 to 18 with low kinetic, non-deforming, non-open long bone trauma will be included.