아치테이핑이 유연성 평발을 가진 대상자의 Y-Balance Test와 무릎과 발목의 관절가동범위에 미치는 영향

Effects of Arch Taping on Y-Balance Test, Range of Motion of Knee and Ankle Joint in Subjects with Asymptomatic Flexible Flatfoot

ackground Flatfoot causes kinematic changes in the lower extremities and poor postural control, and it acts as a risk factor for lower extremity injury. Arch taping is used clinically as an intervention for flat foot; however, studies on how the taping intervention affects dynamic balance are insufficient. Objectives This study investigated the effect of arch taping on Lower Quarter Y-Balance Test (YBT-LQ) performance when subjects with flatfoot performed the YBT-LQ, a dynamic balance test. Methods This study included 28 healthy adults who were diagnosed with flexible flatfoot in the navicular drop test. Before and after arch taping, the YBT-LQ performance, knee flexion range of motion, ankle dorsiflexion range of motion, and navicular height were measured. A paired t-test was used to compare the YBT-LQ performance, the range of motion of the knee and ankle, and the arch height ratio before and after arch taping, Pearson correlation was used to measure the correlation between the change in performance and the kinematic change of the lower extremity. Results After arch taping, the YBT-LQ anterior and composite scores significantly decreased (p < 0.001, p = 0.044). When performing the anterior direction, the knee flexion range of motion was significantly increased (p < 0.001), and the ankle dorsiflexion range of motion was significantly decreased (p < 0.001). There was a positive correlation between YBT-LQ anterior performance and ankle dorsiflexion range of motion (r = 0.599, p < 0.01), and a negative correlation was found between YBT-LQ anterior performance and arch height ratio (r = -403, p < 0.05). Conclusions Arch taping applied to flexible flatfoot restricted ankle dorsiflexion and reduced YBT-LQ anterior performance. Therefore, when performing the dynamic balance test for patients with flexible flatfoot using YBT-LQ in clinical practice, it is necessary to check whether the medial longitudinal arch is excessively lower and to confirm the change in YBT-LQ performance in supporting the medial longitudinal arch.