성인 여성의 만성 발목 불안정성 유무에 따른 한발 전방 점프 착지 시 동적 자세 조절 능력 차이 분석 = Differences in Dynamic Postural Control Ability during Landing Single-leg Forward Jumps in Adult Women With and Without Chronic Ankle Instability

다국어 초록 (Multilingual Abstract)

Objective: The purpose of this study is to analyze the kinematic and kinetic variables of the lower limb during single-leg forward jump landing in adult women with and without chronic ankle instability (CAI) and to examine its effects on postural stability.
Method: Participants were classified into the CAI group (n = 17, mean age 22.18 ± 2.38 years, mean height 161.97 ± 3.66 cm, mean weight 54.30 ± 8.15 kg) and the control group (n = 17, mean age 23.24 ± 2.97 years, mean height 164.32 ± 6.07 cm, mean weight 55.29 ± 6.38 kg). Participants performed a forward jump using the non-dominant foot and landed on the dominant foot. The study measured lower limb joint angles, the center of mass (COM) and center of pressure (COP) inclination angles of the pelvis, loading rate, and leg stiffness. An independent t-test was used to compare postural control ability between the two groups, with the significance level set at α < .05.
Results: Compared to the control group, the CAI group exhibited a significantly smaller hip abduction angle and a significantly greater hip internal rotation angle. The knee flexion angle was larger, and the ankle dorsiflexion and inversion angles were significantly greater in the CAI group. In terms of the COM-COP inclination angle of the pelvis, the anterior-posterior inclination angle was significantly smaller in the CAI group.
Conclusion: Differences were observed only in kinematic variables during movement, whereas no significant differences were found in loading rate and leg stiffness. This suggests that the two groups employ different postural control strategies to absorb the same impact forces and recover a stable posture.