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Professor Gustavo Gasperin and Dr. Mike Piekarski, DPT break down the kinematics of the Straight Ankle Lock.
This is video #1 of a video series explaining anatomically how leg lock submissions work.
Next videos are going to cover the Toehold, Kneebar, Knee Reaping, and Heel Hook submissions.

“What’s the difference between an ankle lock and achilles compression?

A variation on the straight ankle lock is the achilles tendon compression. When dealing with someone who has adequate ankle mobility this variation may elicit a quicker tap compared to the standard ankle lock. Prior to applying a compressive force you want to bring the ankle to end-range plantarflexion so that the tendon has the maximum possible tension.

To finish this variation you use the styloid process of the radius (bony prominence on the end of the forearm/wrist) to compress the tendon at near the base of the calcaneous. The forearm acts as a fulcrum by using the ankle for leverage. The perpendicular shear force introduced by the bone onto the maximally taut tendon will force even people with “flexible feet” to tap.

The advantage of using a move like this is that it targets a musculoskeletal structure which is highly innervated compared to ligaments, which are not. Often when grappling an opponent ignorant of leg locks they will respond too late and by the time they tap damage already occurred. This variation will get the desired response regardless of their knowledge of lower extremity submissions.”