<qa>  What is the bedside echography performed by?4. Material and methods: This therapeutic, mono-centre, prospective, randomized, cross-over, open, controlled trial is being conducted in 70 patients. All the patients will have the two different echographic methods in a sequential but randomized way. The robot-based tele-echography is performed by a radiologist in the North University Hospital of Grenoble. The bedside echography is performed by the emergency physicians in the trauma center in the South University Hospital of Grenoble. 