@article{ref1,
title="Change with increasing age in control of the lower limbs during jump-landing in adolescents: a 5-year prospective study",
journal="Journal of orthopaedic science",
year="2013",
author="Sasaki, Shizuka and Tsuda, Eiichi and Yamamoto, Yuji and Maeda, Shugo and Hayashi, Yoshimitsu and Kimura, Yuka and Sasaki, Eiji and Fujita, Yuki and Takahashi, Ippei and Umeda, Takashi and Nakaji, Shigeyuki and Ishibashi, Yasuyuki",
volume="18",
number="5",
pages="774-781",
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.<p /> <p>Language: en</p>",
language="en",
issn="0949-2658",
doi="10.1007/s00776-013-0420-3",
url="http://dx.doi.org/10.1007/s00776-013-0420-3"
}