 The patients are randomly separated into three groups of 130 people. All the patients have a radiography and then, according to their group, they have either an ultrasonography or an ultrasonography and a stress radiography or only a stress radiography. The patients are followed up during two years by sending two questionnaires CAIT and LEFS at one and two years. The functional scores of these questionnaires assess and compare the functional complications for each group. Thus the radiologic examinations can be assessed in term of prognosis. 