CONCIOUSNESS
the state of being conscious; awareness of one's own existence, sensations, thoughts, surroundings

A heel hook is a leg lock affecting multiple joints, and is applied by transversely twisting the foot either medially or laterally. The torsional force puts severe torque on the ankle, which in turn transfers torque to the knee. The heel hook is generally considered to be a very dangerous leg lock, with a high rate of injury, especially to ligaments in the knee. It was subsequently banned in many combat sports featuring other leg locks such as Brazilian jiu-jitsu[2] and Sambo[3]. The heel hook is however an allowed technique in some submission wrestling and mixed martial arts competitions.

SMALL JOINT MANIPULATION IS NOT PERMITTED FOR TWO REASONS:

1. Damage to these joints can result in permanent impairment and career-ending loss of ability to effectively use the body part.
2. Due to the fragility of these joints, opponents are not given a sufficient opportunity to submit before the submission is fully executed and the damage is done.

THE VERY SAME RATIONALE APPLIES TO THE HEEL HOOK.

When a heel hook is applied, by the time the opponent feels the pain associated with the move and taps, it is quite likely that his knee and its ligaments have already been destroyed. The heel hook stands out among large joint submissions as one that is not only the most damaging, but one that provides the least opportunity to submit before it is executed to completion.

With that said, I would be willing to bet that if you surveyed professional fighters, more would prefer to punched or kicked in the head while unconscious than to have a heel hook performed to completion on them.

Every time a heel hook is applied and completed, the receiver is out for a minimum of six months and is almost guaranteed to return to the cage a reduced version of his former self. Very few athletes in any sport who require knee reconstruction due to torn ligaments will return and perform at 100% of their pre-injury level.

While the heel hook is an impressive submission and everybody loves clips like Ryo Chonan vs. Anderson Silva, is the potential drama provided by this one move worth the risk of the sport’s top stars being out for extended periods of recovery and possibly forced into retirement with a career-threatening injury? The move is literally designed to tear apart the ligaments of the knee, and is applied in such a manner that there is little opportunity to submit before the damage is done.

And don’t get me wrong. I greatly admire the legacy of Ken Shamrock, and it would be a slight source of sadness to see one of his signature moves go by the wayside, given his contributions to the rise of mixed martial arts. But at the same time, Royce Gracie employed headbutts and fought in a gi, both of which are now illegal with virtually no complaint from anyone.

I, for one, am willing to forego the (often grotesque) visuals of the heel hook and suffer the knowledge that the fighters are employing one less (minor) combat skill in order to ensure that my favorite fighters are competing longer and with the same knee ligaments (and agility) they were given at birth.

are you serious or just acting the troll?

Look. The clue is in the word 'conciousness'