This study aimed to investigate the effects of the 8 week FIFA 11plus Kids program on kinematic risk factors for ACL injury in preadolescent female soccer players during single-leg drop landing. For this, 36 preadolescent female soccer players (10 to 12 years old) were randomly allocated to the FIFA 11plus Kids program and control groups (18 players per group). The intervention group performed the FIFA 11plus Kids warm-up program twice per week for 8 weeks, while the control group continued with regular warm-up. Trunk, hip, and knee peak angles (from initial ground contact to peak knee flexion) were collected during the single-leg drop landing using a 3D motion capture system. A repeated measure ANOVA was used to analyze groups over time. Significant group x time interactions were found for the peak knee flexion, with a medium effect size (p = 0.05; effect size 0.11), and peak hip internal rotation angles, with a large effect size (p < 0.01; effect size 0.28). We found that the FIFA 11 plus Kids program was effective in improving knee flexion and hip internal rotation, likely resulting in reducing ACL stress during single-leg drop landing in young soccer players.

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