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- Title
Étude radiologique de face des métatarsiens en charge sur un pied normal et porteur d'un hallux valgus.
- Authors
Jarde, O.; Vernois, J.; Basse, G.; Dumas, J.; Boustani, H.
- Abstract
Owing to the heads of the metatarsals the forefoot has a harmonious shape. The results of this study show that it can be compared to one or several geometrical shapes - two circles or an ellipsis. The study does not allow the definition of the ideal centres of these shapes. The choice of different points is not foreign to this unsa- tisfactory result. It is difficult to determine the head of the metatarsal. The choice of this reference is therefore discussed. The extremity of the metatarsal is an easier reference to define, but it does not give improved results. The choice of the X-axis and Y-axis should be easy to choose, hence the selection of the M2 axis and its perpendicular passing through the centre of its heads. This second axis is not a very good choice (it is difficult to determine the centre of the heads). It would perhaps be more interesting to choose the axis passing through the centre of the lateral sesamoïd, as Maestro et a!. also recommend. In spite of the errors in the choice of reference, a geometric shape combined, whether it be two circles or an ellipse, and integrated in the forefoot, takes shape during this study. The inter-metatarsal angles are constant, and the geometric progression of ratio two between the metatarsals is the current reference of normality. The use of a measure software enables the easy and accurate realisation of measures, as well as the definition of a geometric shape. The manual determination of these shapes is difficult and uncertain. The quality of X-rays slows down the digital recording. It has meant the elimination of many X-rays. This study has a principal flaw: the heterogeneousness of its population. This heterogeneousness has not allowed a definition of the geometric normality. The selection of the population and the improvements of reference points has meant that it is possible.
- Subjects
GEOMETRY; CIRCLE; ELLIPSES (Geometry); POPULATION; CONIC sections; MATHEMATICS
- Publication
Foot Medicine & Surgery / Medecine et Chirurgie du Pied, 2004, Vol 20, Issue 2, p35
- ISSN
0759-2280
- Publication type
Article
- DOI
10.1007/s10243-004-0012-1