The Symposia will present to the audience the latest knowledge in PF imaging (bony abnormalities, cartilage and soft tissues damages) and the latest procedures available for treating an abnormal PF joint . The presentations will very didactic for giving the surgeons the best way to take care of a patient with a patellar dislocation and avoid any unsatisfactory result. The major guidelines will be outlined for the best "menu à la carte" program. A large part will be dedicated to the discussion and questions with the audience.