tibial torsion

tibial torsion [L, tibia + torquere, to twist] , a lateral or a medial twisting rotation of the tibia on its longitudinal axis. It is similar to pronation of the hand, caused by the contraction of the pronator teres and the pronator quadratus, or supination of the hand caused by the contraction of the supinator muscle. Compare femoral torsion.

Internal tibial torsion (Duderstadt, 2006)