Discussion
ACL injuries, Trunk lateral flexion, Trunk flexion, Hip flexion, Knee flexion, jointSeveral deficiencies
In this study, we aimed to investigate the effects of 8 weeks of FIFA 11 + warm-up injury prevention program on knee kinematics and knee and ankle joint position sense in adolescent male and female soccer players. The main finding was that 8 weeks of FIFA 11 + warm-up program has the potential to improve knee valgus angle which has been considered as the main predicted angle for ACL injuries.The finding of the current study showed among all kinematic factors the knee valgus angle in both gender significantly improved. Knee valgus is a faulty movement pattern characterized by the tibial and femoral motions resulting in the medial displacement of the knee jointSeveral deficiencies such as anatomical, hormonal, and biomechanical factors cause more prevalence of high knee valgus in women compared with menDespite the results related to knee valgus although other kinematics factors showed improvement in both groups but there are no significant differences among the 11 + group and regular warm-up program group in kinematic factors such as Ankle dorsiflexion, Knee flexion, Hip flexion, Trunk flexion, and Trunk lateral flexion. This may be related to the fact which 11 + warm-up program does not address movements in all planes of motion equallyThe second parts of our results indicate 8 weeks of the FIFA 11 + warm-up program significantly improved JPS error compared to the traditional warm-up program. This result confirms that FIFA 11 + warm-up is superior to a regular warm-up program when the aim is to recover proprioceptor acuity of the knee and ankle and hence can positively affect injury prevalence in male soccer players.In line with the current study Daneshjoo et al. (2012) investigated the effect of the FIFA 11 + warm-up program on knee joint position sense in both genders of football players. The result of their study showed significant improvement in proprioception error of the targeted angle of knee flexionThere are some limitations in the present study. It has been suggested to achieve a positive and significant effect on biomechanical measures long-term programs should be applied