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- Title
Change with increasing age in control of the lower limbs during jump-landing in adolescents: a 5-year prospective study.
- Authors
Sasaki, Shizuka; Tsuda, Eiichi; Yamamoto, Yuji; Maeda, Shugo; Hayashi, Yoshimitsu; Kimura, Yuka; Sasaki, Eiji; Fujita, Yuki; Takahashi, Ippei; Umeda, Takashi; Nakaji, Shigeyuki; Ishibashi, Yasuyuki
- Abstract
Background: A discrepancy in the incidence of anterior cruciate ligament injury in males and females appears after puberty; however, little is known about changes that occur in control of the lower limbs during jump-landing in adolescents. Methods: Twenty-five male and 29 female 5th grade students (age 10-11 years) participated at the beginning of study and were followed for 5 consecutive years. Control of the lower limbs during jump-landing was evaluated by use of a drop-jump test and 2-dimensional video analysis. The K/ H ratio, which was determined by dividing the knee-separation distance by the hip-separation distance, was calculated for initial contact (IC) and for maximum knee flexion (MKF). Results: In all grades female subjects had a significantly lower K/ H ratio at both IC and MKF than male subjects. Although no statistically significant difference in K/ H ratio between age categories was shown at either IC or MKF for male subjects, K/ H ratio at IC and MKF decreased significantly between 5th grade and 9th grade for female subjects. Conclusion: This study suggests that adolescent females have a lower K/ H ratio during jump-landing than male subjects of the same age, and that K/ H ratio for females decreases with increasing age.
- Subjects
ANTERIOR cruciate ligament injuries; TEENAGER physiology; LEG physiology; JUMPING; AGE factors in disease; PHYSIOLOGY
- Publication
Journal of Orthopaedic Science, 2013, Vol 18, Issue 5, p774
- ISSN
0949-2658
- Publication type
Article
- DOI
10.1007/s00776-013-0420-3