농구동호인의 만성발목관절불안정성 유무에 따른 낙하수직점프 시 하지의 운동학적 비교

Abstract

This study aimed to compare and to analyze lower extremity kinematics during drop vertical jump depending on chronic ankle instability(CAI) among basketball club members. For 34 basketball club members who are currently affiliated with the B Metropolitan City Sports Association, 18 CAI groups and 16 CON groups were classified according to the CAI standards provided by the International Ankle Consortium. Drop vertical jump is performed to measure the one-leg drop landing pattern, and joint movement at the initial contact (IC), and the point of peak knee flexion. In addition, the one-leg drop landing pattern was tested with the muscular activity of tibialis anterior, peroneus longus, medial gastrocnemius and gluteus medius at landing phase. The results of this study showed that knee flexion angle at the point of peak knee flexion was confirmed to be larger in the CAI group(129.79±5.26°) than in the CON group(124.71±3.84°). In both groups, larger ankle dorsiflexion displacement during drop vertical jump was associated with larger knee flexion displacement(respectively r=.568, p=.014; r=.738, p=.001) and at the initial contact larger ankle dorsiflexion angle (r=.747, p=.001; r=.872, p=.001) and knee-flexion angle (respectively r=.497, p=.036; r=.818, p=.001). These results are thought to be a risk factor for re-injury of ankle joints and non-contact injury of knee and hip joints due to changes in the kinetic chain of the lower extremities due to CAI, and changes in the lower extremities should also be considered for rehabilitation or prevention of CAI.