Each companion sport injuries, especially knee injuries, the most complex structure of human musculoskeletal system, consisting of the femur, tibia, patella, with a large number of surrounding and acting on the soft tissues, the aim is to stabilize, and also able to retain the highest mobility. The aim of this study was to know the specifics of rehabilita-tion after knee injuries in American football players and evalua-tion of its effectiveness, knowledge of the most common knee injury and the circumstances in which they arise. They wanted to see whether the item the player has to do with the type of injury sustained Material and method. The study included 15 players who play in teams Polish American Football League, who completed a questionnaire containing questions IKDC form 2000. Results. On the basis of the analysis showed that the most common knee injury is what athletes suffer ACL injury and which occurs as often in training every match. It is noted that the process of rehabilitation often is not fully effective.

Key words: physiotherapy, knee injury, american football.