Muscle trauma mainly results from sporting activities and accounts for 10 to 55% of sports injuries.~Information on ARFI muscle trauma management is scarce. The present study sought to assess the initial ARFI characteristics of muscle in sports people with and without injury.~Our objective here is to evaluate the inter and intra observer reproducibility of the measure of elasticity using Acoustic Radiation Force Impulse (ARFI) ultrasonography of muscles of patients with and without hamstring injury.~76 patients will be evaluated cross sectionally twice by two ultrasonographists(and then we will evaluate the evolution after 3 months for patient with injury according to the ARFI results).
Our objective is to evaluate the inter and intra observer reproducibility of the measure of elasticity using Acoustic Radiation Force Impulse (ARFI) ultrasonography of mucles of patients with and without hamstring injury.~76 patients will be evaluated cross sectionally twice by two ultrasonographists.