1. A device for establishing a complete three-dimensional representation of a patient's limb from a small number of measurements taken on the limb, the device comprising: means for taking measurements on the patient's limb, said measurements comprising a height measurement (H) and a plurality of circumference measurements (b, c, g) taken at different predetermined measurement positions (zb, zc, zg); means for storing a first data file containing the coordinates (x 0 , y 0 , z 0 ) of a first mesh of points ( 24 ) representative of the morphological characteristics of a reference limb, these points ( 28 ) being distributed in three-dimensional space over the surface of the reference limb along a succession of outlines ( 26 ) defined at different successive positions (Z) along the limb; and morphology generator means suitable for recalculating the coordinates of the first mesh of points as a function of said height measurement (H) and of said circumference measurements (b, c, g) so as to produce and store a second data file comprising the coordinates (x, y, z) of a second mesh of points representative of morphological characteristics of the patient's limb.