Intro to Leg Locks and Heel Hooks — What They Are, Why They Are Dangerous, When to Learn
Leg locks are the core meta of modern no-gi and ADCC. The types (ankle lock, kneebar, heel hook), why heel hooks are especially dangerous, and when and how to learn them safely. A concept and safety guide.
Watch no-gi or ADCC these days and you'll see a lot of matches end with a leg attack, right? Those are leg locks. The heel hook in particular is central to the modern jiu-jitsu meta, and it's also the most dangerous technique. Here's only what beginners need to know — this is not a technique lesson, it's a safety and concept guide.
Types of leg locks (briefly)
- Straight ankle lock: the most basic, attacking by extending the ankle. Relatively safe, so it's often taught as the first leg lock.
- Kneebar: hyperextends the knee. Powerful, medium risk.
- Heel hook: twists the heel to attack the knee ligaments. The most dangerous.
It twists the shin while the knee is bent, so the knee ligaments can tear all at once. A complete ACL rupture from a heel hook has been reported in a medical journal. That's why applying it "slowly and with control" is the absolute rule.
When should you learn them?
- Fundamentals first: learn positions, passing and basic submissions first. Go for legs from day one and your game grows lopsided.
- Check your gym and partners: only with a coach who teaches leg locks properly and partners who take them safely. Don't try them on people you don't know.
- Start with defense: for beginners, learning how to escape first is safer and more practical than learning to attack.
In competition?
The IBJJF bans heel hooks in gi matches and, since 2021, allows them in no-gi only in adult brown and black belt divisions. Other organizations have different rules. Always check in advance the rules of the tournament you're entering. For rule differences between divisions, see the bracket and rules articles too.
Source: IBJJF rules update (2021, heel hook scope) · Baker et al., Knee Surg Sports Traumatol Arthrosc (ACL rupture from a heel hook)
Leg locks are powerful, but go slow. Heel hooks can damage the knee ligaments in an instant, so don't get greedy, and beginners should start with defense. The one who keeps rolling the longest wins.