Kinematic Analysis of Lower Extremity Joint Movements during Sidestep at Different Sidestep Speeds / 대한스포츠의학회지

ABSTRACT

The purpose of this study were to examine the effects of the speed of sidestep in a specific direction on the kinematic variables of the lower extremities and to provide basic information on sidestep. The subjects of this study were eight students at Hanseo University who did not have a problem in lower extremity alignment. Biomechanical data were collected using a motion analysis system and force plate and Kruskal-Wallis test was performed in order to test differences according to speed. The results of this study were as follow. First, as to hip joint angle according to speed, when the speed increased, in the sagittal view, the maximum flexion angle decreased, the range of motion (ROM) decreased, and the flexion angle at the highest ground reaction force decreased, and in the transverse view, the internal rotation angle at the highest ground reaction force increased. Second, as to knee joint angle according to speed, when the speed increased, in the sagittal view, the maximum flexion angle decreased, the ROM decreased, and the flexion angle at the highest ground reaction force decreased, and in the coronal view, the maximum varus angle decreased, and the ROM decreased. Third, as to ankle joint angle according to speed, when the speed increased, in the sagittal view, the ROM decreased, and the dorsiflexion angle at the highest ground reaction force decreased, and in the coronal view, the minimum inversion angle increased. This suggests that high-speed sidestep during a game increases the risk of injury and degenerative arthritis among athletes.