Maedeh Taghizadeh Kerman - Department of Sports Injury and Corrective Exercises, Faculty of Physical Education and Sport Sciences, Bu-Ali Sina University, Hamadan, Iran.
Ali Yalfani - Department of Sports Injury and Corrective Exercises, Faculty of Physical Education and Sport Sciences, Bu-Ali Sina University, Hamadan, Iran.
Ahmad Ebrahimi Atri - Department of Sports Physiology, Faculty of Sports Sciences, Ferdowsi University of Mashhad, Mashhad, Iran.

Objectives: Children aged ۱۰ to ۱۲ years often show dangerous maneuvers during landing, which include increased knee valgus, placing them at higher risk of anterior cruciate ligament (ACL) injuries. The study aimed to investigate the relation of the trunk and hip kinematics with the peak knee abduction angle during single-leg landing among preadolescent female soccer players. Methods: Thirty-six preadolescent female soccer players aged ۱۰ to ۱۲ years attended the study. Participants did a static trial and after that performed landing trials. A single-leg landing was applied to assess the landing kinematics. A three-dimensional motion capture system was applied to analyze trunk, hip, and knee kinematics. Results: Pearson correlation coefficient demonstrated a significantly positive relationship between peak hip internal rotation angle (r=۰.۳۶۱) (P=۰.۰۳) and peak knee abduction angle. Furthermore, no significant relationship was identified between peak hip adduction (r=-۰.۱۰۲) (P=۰.۵۵), peak trunk rotation (r=۰.۲۳۹) (P=۰.۱۶), peak trunk lateral flexion (r=۰.۰۵۲) (P=۰.۷۶), and peak valgus knee. Discussion: Peak hip rotation angle was correlated with the valgus knee with a weak correlation value among preadolescent female soccer players. Future studies should consider kinematic risk factors related to ACL injuries in combination with neuromuscular control trunk and hip during more demanding tasks.

Anterior cruciate ligament, Knee, Kinematic, Landing