Kneebar
A leg lock attacking the knee by hyperextending it. Functions similarly to an armbar applied to the leg.
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In Short
The kneebar is a leg-lock submission that hyperextends the opponent's knee joint by isolating the leg between the attacker's thighs and elevating the hips. It is commonly entered from positions like 50/50 guard or ashi garami, though it is less injury-aggressive than the heel hook.
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The leg armbar
The kneebar is a leg-lock submission that hyperextends the opponent's knee joint. The mechanic is similar to an armbar applied to the leg — the attacker isolates the leg between their thighs, grips the foot or shin, and elevates their hips to hyperextend the knee.
The technique is less injury-aggressive than the heel hook but produces similar structural damage if held past the tap.
Mechanics
From a 50/50 guard or ashi garami position:
- Establish leg entanglement: trap the opponent's leg between yours.
- Pin the foot to your chest or armpit: control the opponent's foot to prevent rotation.
- Bridge the hips: lift your hips toward the ceiling to apply pressure on the knee joint.
- Maintain control: keep the opponent's foot pinned and the leg straight.
- Finish: the hyperextension at the knee produces the tap.
Setup positions
- 50/50 guard: both fighters have a leg pinned. The most common kneebar entry in modern MMA.
- Ashi garami / single-leg-X guard: a leg-entanglement position with both legs around the opponent's trapped leg.
- From top mount: attacking the opponent's leg as they defend.
- From north-south: rotating to the leg as the position allows.
- Imanari roll: a rolling entry to leg-lock positions, named after Masakazu Imanari.
Common errors
- Knee not centered: the attacked knee needs to be centered against the attacker's groin; off-center positioning reduces the lever.
- Leg not straight: the opponent's leg needs to be extended for the hyperextension to apply.
- Hand position on the foot: gripping high on the leg vs the foot changes the lever — the foot grip provides the cleanest lock.
- Loss of foot control: if the opponent rotates the foot, the lock comes apart.
Defense
- Hide the foot: pointing the foot inward (toward the attacker) makes rotation impossible.
- Hand fight on the wrist: gripping the attacker's wrist to prevent the foot lock.
- Spin out: rotating away from the lock direction.
- Counter-attack: from the same position, attacking the opponent's leg with your own technique.
Variations
- 50/50 kneebar: the canonical entry from 50/50 guard.
- Belly-down kneebar: applying from a face-down position.
- Standing kneebar: rare but possible from clinch range against an overextended leg.
Exemplified by
- Rousimar Palhares: kneebar finishes alongside his heel-hook game.
- Frank Mir: the kneebar finish of Brock Lesnar at UFC 81 (Mir's UFC heavyweight title-eliminator bout — Lesnar's MMA debut).
- Ryan Hall: integrated kneebars into the broader leg-attack system.
- Imanari: the namesake of the rolling-leg-attack entry technique.
Drills
- Position drill: from 50/50 guard, drill the kneebar entry and finish.
- Imanari roll drill: practice the rolling entry from standing or kneeling positions.
- Defense drill: partner attacks the kneebar; you practice hiding the foot and spinning out.
- Live leg-attack sparring: rounds where leg attacks are the primary target.
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Frequently Asked
- How is the kneebar mechanically applied?
- The attacker isolates the leg between their thighs, grips the foot or shin, and elevates their hips to hyperextend the knee. The mechanic is similar to an armbar applied to the leg.
- What are the common setup positions for a kneebar?
- Common entries include 50/50 guard, ashi garami (single-leg-X guard), from top mount, from north-south, and the Imanari roll.
- What are common errors when attempting a kneebar?
- Errors include not centering the knee against the attacker's groin, failing to keep the opponent's leg straight, incorrect hand positioning on the foot, and loss of foot control which allows rotation.
- How can a fighter defend against a kneebar?
- Defense strategies include hiding the foot by pointing it inward to prevent rotation, fighting for the wrist to prevent the foot lock, spinning out away from the lock direction, or counter-attacking the opponent's leg.
- Which fighters are known for using the kneebar?
- The technique is exemplified by Rousimar Palhares, Frank Mir (who finished Brock Lesnar at UFC 81), Ryan Hall, and Imanari.