Background:Previous studies have attempted to determine prognostic factors for predicting the occurrence of noncontact anterior cruciate ligament (ACL) injuries. However, studies on risk factors for noncontact ACL injuries in Asian female soccer players are limited.Purpose:To identify intrinsic risk factors for noncontact ACL injuries among young female Asian soccer players.Study Design:Cohort study; Level of evidence, 2.Methods:This study evaluated 145 female Japanese soccer players for potential risk factors for noncontact ACL injury during the preseason medical assessment. In total, 25 variables were examined—including anthropometric data, joint range of motion, muscle flexibility, muscle strength, and balance measurements. Participants were monitored throughout a single season for noncontact ACL injuries diagnosed by physicians.Results:Noncontact ACL injuries occurred in 13 knees of 13 players (9%). Lower hamstring-to-quadriceps ratio (0.44 ± 0.07 vs 0.50 ± 0.10; P = .04), greater knee extension muscle strength (3.2 ± 0.5 vs 2.7 ± 0.5 N·m/kg; P < .01), and longer playing experience (10.8 ± 3 vs 8.1 ± 4.2 years; P = .02) were significantly associated with new-onset noncontact ACL injuries in young female soccer players. No statistically significant between-group differences were found for any other variables.Conclusion:New-onset noncontact ACL injury in young female soccer players was significantly associated with lower hamstring-to-quadriceps ratio, greater knee extension muscle strength, and longer soccer experience. These findings will help develop strategies for preventing noncontact ACL injuries among female soccer players.

中文翻译：

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年轻女子足球运动员非接触性前交叉韧带损伤的内在危险因素：一项前瞻性队列研究


背景： 既往研究试图确定预测非接触性前交叉韧带 （ACL） 损伤发生的预后因素。然而，关于亚洲女子足球运动员非接触性 ACL 损伤危险因素的研究有限。目的： 确定年轻亚洲女子足球运动员非接触性 ACL 损伤的内在危险因素。研究设计： 队列研究;证据水平， 2.方法： 本研究评估了 145 名日本女足球员在季前赛医学评估期间非接触性 ACL 损伤的潜在危险因素。总共检查了 25 个变量——包括人体测量数据、关节运动范围、肌肉柔韧性、肌肉力量和平衡测量。参与者在整个赛季中接受医生诊断的非接触性 ACL 损伤的监测。结果： 13 例球员 （9%） 的 13 个膝关节发生非接触性 ACL 损伤。较低的腘绳肌与股四头肌比值（0.44 ± 0.07 对 0.50 ± 0.10;P = .04），膝关节伸展肌力更大 （3.2 ± 0.5 vs 2.7 ± 0.5 N·m/kg;P < .01），以及更长的比赛经验（10.8 ± 3 对 8.1 ± 4.2 年;P = .02） 与年轻女子足球运动员新发非接触性 ACL 损伤显著相关。对于任何其他变量，未发现具有统计学意义的组间差异。结论： 年轻女子足球运动员新发非接触性 ACL 损伤与较低的腘绳肌与股四头肌比值、较大的膝关节伸展肌力和更长的足球经验显著相关。这些发现将有助于制定预防女子足球运动员非接触性 ACL 损伤的策略。