The Effects of Chronological Age and Stage of Maturation on Landing Kinematics in Elite Male Youth Soccer Players

Read, Paul J and Oliver, Jon L and De Ste Croix, Mark B and Myer, Gregory D and Lloyd, Rhodri S (2017) The Effects of Chronological Age and Stage of Maturation on Landing Kinematics in Elite Male Youth Soccer Players. Journal of Athletic Training. ISSN 1062-6050 (In Press)

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Abstract

Context: Despite the high frequency of knee injuries, there is a paucity of research to show the effects of chronological age and stage of maturation on knee joint kinematics in male youth soccer players. Objective: To employ a ‘coach friendly’ screening tool to examine knee valgus scores for players of different ages and stage of maturation. Design: Cross sectional study Setting: Academy soccer clubs Patients or other participants: 400 elite male youth soccer players aged between 10-18 years, categorized by chronological age and stage of maturation (pre, circa or post puberty) based on their years from peak height velocity (PHV). Main outcome measures: Knee valgus was evaluated during the tuck jump assessment via two-dimensional analysis. Participants were subjectively classified as minor (<10°), moderate (10-20°), or severe (>20°) and using these classifications, scored as follows: 0 = no valgus; 1 = minor; 2 = moderate; 3 = severe. Results: A trend of higher valgus scores were shown in the younger age groups and pre-PHV players. The lowest frequency of “no valgus” were in the U18s and post-PHV players. The highest percentage of “severe” scores were in the U13s. Knee valgus scores were significantly lower in the U18s on both legs than all other age groups (p < 0.001), except for the U16s. Post-PHV players’ scores were significantly lower than pre-PHV youth on the right leg (p <0.001), and both pre- and circa-PHV players on the left leg (p <0.001). Noteworthy inter-limb asymmetries were evident in the U14s, U15s and circa-PHV players. Conclusions: Reductions in knee valgus with incremental age and during the later stages of maturation indicate that this risk factor is more prevalent in younger players. Inter-limb asymmetry may also emerge around the time of the peak growth spurt and early adolescence, potentially increasing the risk of traumatic injury.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: Valgus; Injury risk; Asymmetry
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure > GV557 Sports > GV861 Ball games: Baseball, football, golf, etc.
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Schools and Research Institutes > School of Sport & Exercise > Sport and Exercise
Research Priority Areas: Sport, Exercise, Health & Wellbeing
Depositing User: Alan Sparkes
Date Deposited: 14 Aug 2017 13:34
Last Modified: 18 Aug 2017 17:07
URI: http://eprints.glos.ac.uk/id/eprint/4861

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