default inclusion

Evaluate ankle's ultrasound contribution in the accuracy of ankle's diagnosis of traumatic injuries (objectivated by reference's examination : ankle's MRI)

Inclusion Criteria:

• Age ≥ 5 years and < 18 years
• Isolated's trauma from one or both ankles
• First-line consultation for pediatrics emergencies at the University Hospital of Lille
• Informed and written consent of the holders of parental authority

Exclusion Criteria:

• Age < 5 years and ≥ 18 years
• History of trauma of the same ankle dating from less than 3 month
• History of surgery of this same ankle
• Constitutional or acquired bone disease
• Associated trauma affecting another anatomical region than the ankle or midfoot
• Polytrauma (presence of several traumas including at least one endangers vital functions)
• Associated wound requiring surgical exploration
• initial management of this trauma in another center
• Non affiliation to a social security scheme