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19 Sex-dependent differences on knee frontal moment in pre-adolescent and adolescent ages during a cutting maneuver task
  1. Mohammadhossein Ghasemi1,
  2. Haraldur Björn Sigurðsson1,2,
  3. Þórarinn Sveinsson1,2,
  4. Kristín Briem1,2
  1. 1Department of Physical Therapy, University Of Iceland, Iceland
  2. 2Research Centre of Movement Science, University Of Iceland, Iceland


Introduction Although the rate of anterior cruciate ligament (ACL) injury is low among children, it increases during adolescence, especially in girls. The injury typically occurs immediately after foot-ground contact during sports activities such as a cutting maneuver (CM). The knee frontal plane moment (KFM) has been implicated as a biomechanical risk factor, but it has not been extensively studied within the injury timeframe. The present study aimed to prospectively investigate sex-dependent changes in the KFM from pre-adolescence to adolescence during the first 70 ms of a CM task.

Methods A total of 293 handball and soccer players, aged 9–12 years, were recruited to perform a CM, where kinematic and kinetic data were obtained using marker-based motion capture and force plates. Those who continued sports participation (n=105) returned five years later to repeat the test procedure. A mixed-model analysis of variance (ANOVA) for repeated measures was used for statistical analysis of the KFM during the first 70 ms after foot-ground contact.

Results Overall, boys had significantly higher valgus KFM values than girls across both data collections (P=0.001). Also, a significant interaction between sex and age was observed, where girls and boys demonstrated respectively an increase and decrease in the valgus KFM values from pre-adolescence to adolescence age (13.8% increase vs. 10.6% decrease: P=0.001).

Conclusion The remarkable increase of KFM in adolescent athlete girls may, in part, play a role in their risk of ACL injury, although future studies need to assess the relationship between this increase and rate of ACL injuries.

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