Investigation of Impact Absorption Function of Carbon Plantar Plate for Low Arch Foot

At present, it cannot be said that the impact absorption function of the truss structure of the foot arch during static standing has been elucidated.In this study, the spring constant and the viscous damping coefficient are calculated and examined in order to compare the shock absorption characteristics of the low-arch foot seen in flat feet and the characteristics of the normal-arch foot.In addition, in order to supplement the spring constant and viscous damping coefficient for one case of low arch foot, we investigated using a carbon plantar plate. Six types of carbon plantar plates were compared, with heels and without heels, with 2 layers, 3 layers, and 4 layers.As a result, the low arch foot showed a low spring constant and a high viscous damping coefficient. In the comparison of 6 types of carbon plantar plates, the one with heel showed high spring constant and viscous damping coefficient. The value closest to the normal arch was the 3-layer carbon plantar plate without heel.It was thought that the low-arch foot had a reduced spring function that absorbs impact. The carbon plantar plate with heel cup clearly shows high values of spring constant and viscous damping coefficient, which means that hard to sink the heel.The reason for this is presumed to be the influence of the soft tissue of the heel is likely to collapse due to the heel couter.The carbon plantar plate used this time was not able to compensate for the impact class function of the normal arch foot, so further examination was necessary. However, this research has a small number of subjects, so it is necessary to increase the number of subjects and investigate again. As a future task, we will consider increasing the number of subjects.