サッカー動作における第5中足骨ひずみ分布に対する足底圧分布の影響

抄録

The aims of this study were to conduct finite element analysis to analyze fifth metatarsal strain distribution during soccer movements and to examine the influence of plantar pressure distribution pattern on fifth metatarsal strain concentration at the fracture site. Five subjects performed side-step cutting or cross-step cutting maneuvers. Three-dimensional foot kinematics, ground reaction force, and plantar pressure distribution were measured by using a motion capture system, force plates, and a plantar pressure sensor system, respectively. In addition, a finite element model of a foot, consisting of bony structures, ligaments, and skin, was constructed from Computed Tomography images. As the results of the simulations, in side-step cutting maneuver, maximum principal strain in the fifth metatarsal bone was concentrated from the lateral side at the fracture site. In the case of cross-step cutting maneuverer, maximum principal strain was concentrated from the plantar side at the fracture site. The strain decreased when the plantar pressure at the proximal end of the fifth metatarsal was reduced. In order to prevent fifth metatarsal fracture, a shoe design that can achieve a plantar pressure distribution that reduces strain concentration in the fifth metatarsal is required.