外反母趾患者における歩行時前足部足底圧分布の研究

Abstract

We developed a new plantar pressure analysis method in which F-scan (Tekscan Inc.) and whole foot radiography were combined. In this study, we examined the pressure distribution under the forefeet of patients with hallux valgus during walking and compared the results with those normal subjects. Fifty-seven feet of 35 patients with hallux valgus and 36 feet of 18 normal volunteers were examined. F-scan sensor sheets were attached to their soles and plantar pressure during walking was measured. Subsequently whole foot radiographs were taken immediately with the sheets still attached to the soles. Then we could divide the region into eleven areas which correspond to the skeletal structures with the radiograph. The areas consisted of each toe, each metatarsal head and the lateral sesamoid. The loads applied on each area during walking were assessed. The load under the great toe was less in the hallux valgus group than the normal group. On the contrary, the loads under the second and third toes were increased in the hallux valgus group. The same pattern was observed in the level of the metatarsal heads. These findings showed that the secondand third toes must compensate for the disability of the great toe in patients with hallux valgus.