Tanaka Y, Takakura Y, Kumai T, Samoto N, Tamai S
Department of Orthopaedic Surgery, Nara Medical University, Japan.
J Bone Joint Surg Am. 1995 Feb;77(2):205-13. doi: 10.2106/00004623-199502000-00006.
A new method was devised for the evaluation of medial and lateral splaying of the foot on dorsoplantar radiographs made while the patient is bearing weight. This method involves use of a two-dimensional coordinate system; the axis of the shaft of the second metatarsal is the x axis, the intersection of the x axis with the proximal end of the second metatarsal is the point of origin, and the perpendicular to the x axis that passes through the point of origin is the y axis. This method was used to study the radiographs of 177 feet of 112 female patients who had symptomatic hallux valgus and those of ninety-four normal feet of sixty-four female subjects. The site of origin of metatarsus primus varus in the patients who had hallux valgus was the first metatarsocuneiform joint. The great toe and first metatarsal of the patients who had hallux valgus were longer, on the average, than those of the normal subjects. However, the x coordinates at the tip of the great toe and at the end of the first metatarsal were larger only in the patients who were less than twenty years old, because of the progression of angulation of the great toe and of the first metatarsal in the older patients.
设计了一种新方法，用于评估患者负重时拍摄的足背跖位X线片上足部的内翻和外翻程度。该方法涉及使用二维坐标系；第二跖骨干的轴线为x轴，x轴与第二跖骨近端的交点为原点，过原点且垂直于x轴的直线为y轴。使用该方法对112例有症状拇外翻女性患者的177只脚以及64例女性受试者的94只正常脚的X线片进行了研究。拇外翻患者中第一跖骨内翻的起源部位是第一跖楔关节。拇外翻患者的大脚趾和第一跖骨平均比正常受试者的长。然而，仅在年龄小于20岁的患者中，大脚趾尖和第一跖骨末端的x坐标较大，这是因为老年患者中大脚趾和第一跖骨的成角进展。
