The hypothesis of this study is that ultrasound can better characterize the severity stages of the sprain and can diagnose complications that may have gone unnoticed on physical examination.~Patients will be evaluated clinically : demographics, history, clinical examination, functional scores. Ultrasound and Magnetic Resonance Imaging (MRI) will be performed during the first month to determine the stage of severity and to look for complications. The main aim is to evaluate the interest of ultrasound in the diagnosis of the severity of lateral ankle sprain. The secondary purpose is to compare an ultrasound assessment of severity with clinical and Magnetic Resonance Imaging (MRI) assessment.
Ankle sprain is a frequent and widely trivialized trauma. Misdiagnosed or poorly treated, it can recur and thus develop into chronic ankle instability. It can be associated with complications which, if not detected early, can lead to long-term sequelae.