The Journal of Bone and Joint Surgery, Vol 77, Issue 2 205-213, Copyright © 1995 by Journal of Bone and Joint Surgery, Inc
Radiographic analysis of hallux valgus. A two-dimensional coordinate system
Y Tanaka, Y Takakura, T Kumai, N Samoto and S Tamai
Department of Orthopaedic Surgery, Nara Medical University, Japan.
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.
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