Achilles Lock

Last updated: June 13, 2026

What is an Achilles lock?

The Achilles lock is one of the most common leg submissions in jiu-jitsu and mixed martial arts. A grappler traps an opponent’s leg, wedges the bony edge of the forearm under the heel against the Achilles tendon, then extends the body to bend the foot downward. The pressure lands on the tendon and the ankle joint together, which is why the move is also called the straight ankle lock.

Two things set it apart from other leg attacks. It loads the ankle in a straight line instead of twisting it, and it usually gives the person caught in it time to feel the pressure and tap before anything tears. That combination explains why most coaches teach it as the first leg lock a student learns, and why most rule sets allow it after banning the nastier ones.

The submission has two halves. There is a controlling position, called ashi garami, that isolates the leg so the opponent cannot pull it free, and there is the finishing grip on the foot itself. Without the control, the finish almost never holds.

How the Achilles lock works

The target is the talocrural joint, the hinge where the shin meets the foot. Mike Piekarski, a doctor of physical therapy and BJJ brown belt, points out that this joint moves in only one plane, up and down. Forcing the foot to point downward past its normal range strains the ligaments and the capsule that hold the ankle together.

Grapplearts breaks the finish into two pressures working at once. The first is hyperextension, the foot bending away from the shin. The second is compression, where the attacker’s forearm bone drives into the Achilles tendon close to the heel. A defender might feel one, the other, or both, depending on the grip and the size of the attacker’s arm.

Pressure builds instead of snapping, and that is the heart of the difference between this and a heel hook. The knee only comes into danger when the trapped athlete spins hard to wrench free, which is exactly why coaches tell beginners to turn the correct way or tap early.

Achilles lock vs heel hook

Newer grapplers often file the Achilles lock and the heel hook under the same heading, since both attack the lower leg from similar entanglements. The way each one breaks a body part could not be more different.

	Achilles lock	Heel hook
Main target	Ankle joint and Achilles tendon	Knee, using the heel as a lever
Type of force	Straight hyperextension	Rotation and twisting
Warning before injury	Sharp pain builds, usually leaving time to tap	Little pain until ligaments are already torn
Typical legality	Allowed in most rule sets, including for beginners	Heavily restricted, banned in most gi competition

The heel hook treats the foot as a wrench handle and twists the knee, so the real harm happens at a joint the defender often cannot feel until it is too late. The Achilles lock stays down at the ankle and announces itself loudly, and that warning is the main reason it carries far less risk on the mat.

Where the name comes from

Several names point to the same submission. Catch wrestlers, where the position most likely originated, and judoka, who call it ashi-hishigi, were using versions of it long before modern jiu-jitsu took shape. In Brazil, it picked up the nickname botinha, meaning “little boot,” tied to a grip popularized by Rodrigo Cavaca around 2010.

Foot attacks carried a stigma in early Brazilian jiu-jitsu and were often dismissed as crude, though they were never formally outlawed. BJJ Heroes records that Helio Gracie named the ankle lock among his favorite submissions in a 1932 newspaper report. The technique earned wider respect in no-gi grappling after the ADCC tournament launched in the late 1990s, and Cavaca’s run of wins cemented its place in the gi a decade later.

Is the Achilles lock legal in competition?

Because it applies force in a straight line, the Achilles lock is the most widely permitted leg lock in grappling. In IBJJF events, it is the leg submission lower belts may use, while heel hooks and other twisting attacks stay restricted to higher ranks or no-gi divisions. The competitor also has to angle away from the opponent’s knee rather than into it, since reaping the knee is banned at every belt level.

Rule sets vary a lot. Submission-only and no-gi promotions tend to be far more permissive than traditional gi tournaments, so the precise boundaries shift with the organization and even the year. The IBJJF only legalized heel hooks in its no-gi events in 2021, whereas the straight ankle lock has been allowed for much longer. The throughline is simple: the straight ankle lock sits at the safe end of the leg-lock spectrum, which is how it survives in rule sets that ban nearly everything else.

Frequently Asked Questions

Does an Achilles lock hurt?

Yes. The forearm bone grinding into the Achilles tendon creates a sharp, building pain that normally gives the trapped grappler enough warning to tap before any real damage occurs.

Can an Achilles lock injure you?

It can. Pushed past the tap, it can tear ankle ligaments or, in rarer cases, harm the joint. The knee can also be hurt if someone twists violently to escape instead of tapping.

Is the Achilles lock the same as a straight ankle lock?

For the most part, yes. The two terms describe the same submission. “Achilles lock” stresses the tendon being compressed, while “straight ankle lock” stresses the straight, non-twisting line of the attack.

Why is it called an Achilles lock?

The name comes from its original target, the Achilles tendon, which the attacker’s forearm presses against, where the tendon joins the heel.

---

Sources

1. BJJ Heroes. “Straight Ankle Lock, Achilles lock or ‘Botinha’.”
   https://www.bjjheroes.com/techniques/straight-ankle-lock-achilles-lock-or-botinha
2. Evolve Daily. “BJJ 101: The Ankle Lock” and “Where And When Are Leg Locks Allowed In BJJ?”
   https://evolve-mma.com/blog/bjj-101-the-ankle-lock/
   https://evolve-mma.com/blog/where-and-when-are-leg-locks-allowed-in-bjj/
3. Grapplearts. “Breaking Down the Ankle Lock.”
   https://www.grapplearts.com/breaking-down-the-ankle-lock/
4. Mike Piekarski, DPT, via BJJEE. “The Straight Achilles Lock: Just Pain or Serious Risk of Injury?”
   https://www.bjjee.com/articles/the-straight-achilles-lock-just-pain-or-serious-risk-of-injury/
5. Digitsu. “Straight Ankle Lock Breakdown (BJJ).”
   https://digitsu.com/t/straight-ankle-lock
6. Wikipedia. “Compression lock.”
   https://en.wikipedia.org/wiki/Compression_lock

Related MMA Terms