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Gender differences in cutting maneuver mechanics among young children and the effects of hip strength
Author(s):
Sveinsson H. (Iceland)
,
Sveinsson H. (Iceland)
Affiliations:
Briem Kristin
,
Briem Kristin
Affiliations:
Sveinsson Þ.
,
Sveinsson Þ.
Affiliations:
Árnason Á.
Árnason Á.
Affiliations:
ESSKA Academy. Sveinsson H. 05/09/18; 209307; P02-254 Topic: Biomechanics
Haukur Már Sveinsson
Haukur Már Sveinsson
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Abstract
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Objectives: The aim of this cross-sectional study was to evaluate specific variables in young athletes during cutting maneuvers and analyze the effects of hip strength. The hypothesis is that a greater strength results in less movement of the hip and knee into valgus and internal rotation in the frontal and transverse planes.

Methods: Participants were (68 boys, 94 girls, age 10-12) recruited from local sports clubs. After a 5 minute warm up, isometric strength of the abductors of the hip was measured, then the participants performed 5 repetitions of drop jumps and 5 repetitions of cutting maneuvers for each side in front of a 8 camera motion capture system to capture 3D movements. After a fatigue protocol the cutting maneuvers and drop jump testing procedure was repeated.
The movement and strength data collected during testing was then subjected to mixed model statistical analysis.

Results: Significant differences were found between boys and girls with respect to the correlation between hip abductor strength and frontal plane peak knee angles during cutting maneuvers (p<0.0001). With group analysis the difference between the sexes was that boys exhibited a negative correlation for abductor strength and max knee angles in the frontal plane (P=<0.0001) while girls showed a positive correlation (Significant differences were also found between boys and girls with respect to the correlation between hip abductor strength and peak transverse plane knee angles (P=0.0001). Group analysis of knee angles in the transverse plane resulted in a no correlation between strength and knee angles for the boys (P=0.9) but a significant negative correlation for the girls (P=<0.0001). In the transverse plane of the hip there was a significant difference between boys and girls with respect to the correlation between hip abductor strength and peak transverse hip angles (P=0.0001). Group analysis of hip angles in the transverse plane resulted in a significant negative correlation between strength and hip angles for the boys (P=<0.0001) but no correlation for the girls (P=0.1).

Conclusions: The results of this study indicate that strength is more important for girls than it is for boys in reducing peak valgus and internal rotation angles in the frontal and transverse planes. What is interesting is that greater strength appears to have very different effects between the sexes on movements during unilateral movement tasks .

Keywords:
Knee, Hip, ACL, Strength, Injury prevention, Biomechanics
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