Introduction
lower extremity injuries, long-term disability, lower extremities injuries
Soccer with high demands for dynamic movement, agility, and endurance may exert more loads or forces on the lower extremities joint, which in turn, may raise the frequency of injuryAmong the lower extremities injuries risk factors two of the determinant modifiable are the kinematic factors and proprioception. It is has been showed that a less hip flexion angle, smaller amount of knee-flexion joint angle (within 10–30°)Recently, multi-faceted warm-up programs such as the 11 + The need of clarity with respect to the effect of the 11 + injury prevention program on kinematic risk factors such as dynamic knee valgus in male soccer players and conflicting results in this area is important to supply some clear information. There is insufficient information which shows this program is more effective in injury prevention for young male soccer players or female soccer players. Moreover, because of lower extremity injuries consequence such as long-term disability and huge costs on teams and players, identifying effective risk factors such as kinematic variable and JPS and injury prevention factors in the largest sports population in the world (300 million registered players)