抄録
It proposed the index value of the open Cho rate and the open Cho angle where the spread foot is simply judged without using X rays, and the relation to other diseases is investigated. As a result on subjects, 37% or more in open, 15 degrees or more reached the index value, and the pain by hallux valgus and the pain of the second metatarsal bone were often the cases in open. It seems to be necessary that some treatment with in-sole are required at the early stage to prevent from the injury if the decrease of horizontal arch is found.
