An abnormal twisting or rotation of a bodily part or member on its axis.
https://www.medg.fr/anomalie-de-la-torsion-des-membres-inferieurs 2020 France teaching material scientific and technical information all extremities lower extremity torsion abnormality torsion defect, nos
--- http://www.orpha.net/consor/cgi-bin/OC_Exp.php?Lng=FR&Expert=98806 2011 France scientific and technical information dystonia 6, torsion dystonic disorders torsion abnormality