편평발이 있는 대상자의 오버헤드 스쿼트 시 깔창이 넙다리네갈래근각과 무릎너비에 미치는 효과

Effect of Using Insole on Quadriceps Angle and Knee Width during Overhead Squat in Subjects with Flat Feet

Background Flat foot is a common musculoskeletal disease that affects lower extremities alignment. The insole was used to manage flat feet. To our knowledge, there is no study on the insole effects ankle and knee joint kinematics during overhead squats in subjects with flat feet. Objectives The purpose of the study is to compare the Q-angle and knee width of adults with flat feet according to the presence or absence of the insole during overhead squats. Methods A total of 15 participants with flat feet participated in this study. Flat feet were assessed according to scores on the navicular drop test. To measure Q-angle using Kinovea®, we attached markers to the tibial tuberosity, the center of anterior superior iliac spine and the center of the patella. The participants maintained a static standing position for 10 seconds, and performed the overhead squat for 7seconds. We measured the Q-angle in standing and squatting positions, and knee width while maintaining the squatting position. The difference in outcome measures in squatting with and without an insole was analyzed using a paired t-test. Results In the standing and overhead squatting postures, the Q-angle significantly decreased when using the insole compared to when it was not used (p < 0.05). In the overhead squatting posture, the knee width significantly increased when using the insole compared to when it was not used (p < 0.05). Conclusions These results showed that using an insole can help adults with flat feet in static standing posture and dynamic squat movements.