At this investigation we want to find out whether there is a difference in muscle strength of the internal and external rotation hip muscles between soccer players and non-soccer players caused by typical movement patterns seen in soccer sport.

Nontraumatic hip injuries are a problem often seen in Soccer Players. A biomechanical formation mechanism is probably. Little research has focused on the measurement of hip external and internal rotation strength at soccer players. The purpose of this study is to investigate the influence of soccer sports at the isometric force and force ratio of the hip rotator muscle system. Two samples of Athletes will be compared: Soccer Players (N15) and Non-soccer players (N15) matched in sex, age and level of physical activity to investigate hip rotator force in 3 different angles of hip flexion (0°/45°/90°). The measurement will be made with a handheld dynamometer.

Inclusion criteria:

Study group:

Amateur footballers (N15) in the age between 18 and 35 At least five years of active footballer's career Football training twice weekly Active participation in play No pain or limitations in the area of the hip or the lower extremity

Control group:

Athletes (N15), non-soccer players with now asymmetric leg activities In the age between 18 and 35 At least twice weekly sports activity for at least 30 minutes No pain or limitations in the area of the hip or the lower extremity

Exclusion criteria:

Professions with asymmetric leg activities Pain or limitations in the area of the hip or the lower extremity Surgery on the hip in the prehistory

soccer club of Sarnen, Switzerland Residents of Sarnen and Basel, Switzerland