An abductory twist is a sign of the way we walk which is commonly seen by clinicians. Many people when they are walking, just as the heel comes off the ground there is a sudden and small movement of the heel medially (abduction). Many clinicians don't look at this to be of much importance since it is only a sign of an underlying issue instead of a disorder on its own.
There are many different causes of this abductory twist. One is that the big toe joint must dorsiflex or bend just as the heel comes off the ground to ensure we can move ahead. If that joint does not want to bend, then the foot will abduct to get around the block at the joint. Another prevalent cause is overpronation of the foot. This is where the foot is rolling inwards at the rearfoot and the lower leg is externally rotating trying to roll the foot outwards. As soon as the heel comes off the ground the foot abruptly abducts due to the twisting.
A medial heel whip is another entity that does get confused with an abdutcory twist, but they are different. The twist occurs just as the heel lifts up off the ground and the whip is more of a circumduction of the entire foot as it lifts up of the ground. While the twist and whip are in a similar direction, they are very different things and brought on by different conditions.
The Abductory twist does not have to be treated as it is no problem on its own. It is due to something and that something is the cause of the problem, so that needs managing as opposed to just the abductory twist. The therapy will have to be directed at either the cause of a block in movement at the big toe or the cause of the overpronation of the foot. This means that the treatment usually takes on a variety of possible alternatives, so there is no one solution for this.