Biomechanics of Lowerextremity During the Landing of Stop-jump Phase

This study compares the kinematics difference among different genders. Pearson correlation is used to determine the correlation between the kinematics and the kinetics in lower limbs. Results are as follows: Knee and hip maximum flexion angle, peak posterior-ground reaction force and peak knee extension moment significantly decrease during the landing of the stop-jump period with the female test-takers. The hip flexion angle at the initial foot contact is in significant correlation with the peak posterior-ground reaction force during landing of the stop-jump phase. The knee flexion angle at the initial foot contact shows significant correlation with peak posterior-ground reaction force and vertical-ground reaction forces during landing of the stop-jump phase. The hip and knee flexion angles at the initial foot contact with the ground do not necessarily reduce the impact force during landing, whereas the active hip and knee flexion motions do. The hip and knee flexion motion of landing acts as the key factors that affects anterior cruciate ligament loading during the landing of the stop-jump phase.