The act of turning or twisting, or the state of being twisted; the twisting or wrenching of a body by the exertion of a lateral force tending to turn one end or part of it about a longitudinal axis, while the other is held fast or turned in the opposite direction
1 A motion or state where one end of a part is twisted about a longitudinal axis while the opposite end is held fast or turned in the opposite direction 2 Motion of the sacrum about an oblique axis, with sacral rotation opposite to rotation of L5 3 An unphysiologic motion pattern about an anteroposterior axis of the sphenobasilar symphysis/synchondrosis
Torsion is a twisting effect on something such as a piece of metal or an organ of the body. the twisting of a piece of metal (torsus, past participle of torquere; TORQUE)