title: Correlations between sagittal plane kinematics and landing impact force during single-leg lateral jump-landings.
abstract: [Purpose] The correlations of peak vertical ground reaction force and sagittal angles during single-leg lateral jump-landing with noncontact anterior cruciate ligament injury remain unknown. This study aimed to clarify the correlations between kinematics and impact force during lateral jump-landing. [Subjects and Methods] Twenty active males were included in the analysis. A sagittal-view movie camera and force plate were time synchronized. Trunk and lower extremity sagittal angles were measured 100 ms before initial contact and at peak vertical ground reaction force. Peak vertical ground reaction force, time between initial contact and peak vertical ground reaction force, and loading rate were calculated. [Results] The mean sagittal angle was 40.7° ± 7.7° for knee flexion during the flight phase and 16.4° ± 6.3° for pelvic anterior inclination during the landing phase. The mean peak vertical ground reaction force was four times the body weight. The median time to peak vertical ground reaction force was 63.8 ms. The knee flexion during the flight phase and pelvic anterior inclination angles during the landing phase were related to the peak vertical ground reaction force. [Conclusion] Increasing knee flexion and decreasing pelvic anterior inclination might reduce the impact during single-leg lateral jump-landing.
authors.affiliation: Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Japan.
authors.forename: Junya
authors.initials: J
authors.lastname: Aizawa
authors.affiliation: Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Ohji
authors.affiliation: Joint Surgery and Sports Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Koga
authors.affiliation: Department of Symbiotic Systems Science, Fukushima University, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Masuda
authors.affiliation: Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Japan.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Yagishita
keywords: Flight phase kinematics; Ground reaction force; One-leg lateral landing