[Measurement of tibiofibular torsion with profile radiography. Relation to the shape of the plantar arch].
This study deals first with the measure of the tibio-fibular torsion, on one radiography in profile. The film has only to be set in a parallel direction to the medial edge of the foot, therefore to the first metatarsus. The malleoluses can easily be marked, with some practice. The angle of the torsion can be calculated from its tangent, therefore from the ratio of the distance between the two malleoluses seen in profile, to the bimalleolar distance which could be measured in a front wiew. The latter is in  a nearly fixed ratio with the antero posterior diameter of the lower extremity of the tibia. We then get the formula: (see article) which gives us the torsion from a single radiography taken in profile, centered upon the malleoluses. The same incidence makes it possible to measure the medial plantar arch. The A. have then lodeed for the correlation that should exist, in series of both sexes in France and Congo: a more hallow plantar arch = a stronger T.F.T. The results are very significant indeed, for approximatively r = -- 0,650 in series of 85 individuals.
D005360:Fibula / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000502:physiology*; D005528:Foot / Q000033:anatomy & histology*; D006801:Humans; D011859:Radiography; D012399:Rotation; D013977:Tibia / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000502:physiology*
Mesure de la torsion tibio-fibulaire sur radiographie de profil. Relations avec la forme de la voûte plantaire