[The axial orientation of the phalanges following the curling up of the fingers]

This study follows and modestly completes those by Dubousset and Kapandji concerning the phenomena of axial (or longitudinal) rotation of the phalanges combined with flexion-extension of the fingers. Our analysis of the orientation of axial rotation of the skeletal elements of the digital chain, in relation to each other and during digito-palmar flexion was supported by simple observation, impressions in silicone paste, study of anatomical preparations, three-dimensional computed tomography. The index finger and middle finger tend to supinate. The ring finger undergoes virtually no rotation and the distal end of the little finger tends to pronate. These phenomena, essential for good adaptation to grip and fine manipulation must be taken into account by rehabilitation physicians when the amplitude of these movements are limited by immobilisation or disease.