Finger Locks 2019
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Finger Locks·WinonaJudo
Sensei, 7th Degree Black Belt Keith Polus Demonstrates some finger locking techniques. winonajudo.com
Finger Locks
Family指関節技(Yubi Kansetsu-waza)
TraditionalTranslation: finger locks
Overview
Finger locks are small-joint manipulation techniques that isolate and hyperextend, hyperflex, or laterally deviate one or more fingers beyond their anatomical range. [1],[2] Techniques include single-finger hyperextension, thumb locks, finger peeling (breaking grip by bending back fingers), and multi-finger bending attacks. Finger locks are extremely effective due to the low force required to cause injury — finger joints have minimal muscular protection and very small ligaments compared to major joints. [3] This makes them powerful self-defense tools but dangerous in competition, where the speed of injury onset makes controlled submission impractical. Small-joint manipulation is prohibited in IBJJF, ADCC, IJF, and MMA under Unified Rules. Finger locks remain actively practiced in traditional jujutsu (yubi-waza), aikido (yubi-dori), hapkido, and law enforcement control techniques. [4],[5]
History & Origin
Finger manipulation techniques (yubi-waza) are extensively documented in Daito-ryū Aiki-jūjutsu, where they form part of the art's comprehensive joint-control curriculum. [1],[2] In Aikido, finger techniques (yubi-dori) are practiced as part of weapon-disarming and control sequences. [3] The practice of isolating and attacking small joints was developed in feudal Japan as a method for disarming sword-wielding opponents — breaking or controlling the grip hand neutralized the weapon threat without requiring lethal force. [4],[5] Chinese Chin Na (擒拿) systems also include sophisticated finger-locking methods used in both combat and healing traditions.
Effectiveness
Finger locks isolate and hyperextend individual fingers or the hand, causing pain and potential fractures. [1]
Lineage
Finger locks appear in jūjutsu, aikido, and self-defence systems. They are banned in most competitive grappling formats. [1]
Competition Record
Finger locks are generally banned in BJJ competition (IBJJF) but legal in some submission grappling and MMA events. [1]
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Biomechanical Mechanism
Primary Action — Hyperextension of the elbow joint — the hips drive upward against the posterior humerus while controlling the wrist
Joints Involved — Elbow (extension beyond normal ROM), wrist (stabilized), shoulder (isolated and controlled)
Force Vector — Posterior-to-anterior force on the upper arm with fixed distal anchor at the wrist creates a lever arm across the elbow
Leverage Principle — Hips act as the fulcrum — the longer the lever (full arm extension), the less force needed to hyperextend
Position & Entry
From dominant position — Isolate the target limb, secure the controlling grip, and apply force beyond the joint's range of motion
From guard (bottom) — Control the limb from guard position, configure the submission grip, and apply the lock
From transition — During a scramble or positional change, catch the exposed limb and lock the submission
Variants
Standard variation — primary grip configuration and finishing angle
Gi variation — using the gi material for grip assistance and control
No-gi variation — adapted grips for submission grappling without the gi
Transition variation — applied during a positional change or scramble
Videos
1 video
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Ratings
Risk of injury to the person this technique is applied to
5
High5/10
Finger locks isolate individual digits; dislocations are the primary risk
Skill level needed to execute this technique reliably
Beginner
Whether this technique is allowed under major competition rule sets
Illegal
— IBJJF — Small joint manipulation prohibited at all belt l...
IBJJF Rules Book v6.0, June 2024PDF— IJF — Prohibited
IJF Sport and Organisation Rules 2025, Article 27PDF— ADCC — Small joint manipulation prohibited
ADCC Rules Update, April 2025PDF— Unified MMA — Small joint manipulation is a prohibited foul
Unified Rules of MMA, August 2025PDF— FIAS Sport Sambo — Prohibited
FIAS International Sambo Competition RulesPDF— FIAS Combat Sambo — Prohibited
FIAS Combat Sambo RulesPDFTraining Notes
✓Finger lock techniques hyper-extend individual fingers or groups of fingers — targeting the interphalangeal and metacarpophalangeal joints (Danaher, New Wave Jiu Jitsu, 2020)
✓The most effective finger locks isolate the index or middle finger and apply extension or lateral pressure against the joint
✓Finger locks from grip fighting: when the opponent grips your gi or wrist, peeling back individual fingers creates immediate release and potential submission
✓The figure-four finger lock wraps around one or two fingers and uses the attacker's grip strength against a single digit — overwhelming leverage advantage
✓Finger locks are instantaneous submissions — there is virtually no 'build-up' period; they go from zero to injury very quickly
✓In self-defence, finger locks are practical tools: they can control an attacker's hand and create opportunities to escape or transition
✓Japanese small-joint manipulation (kansetsu-waza) includes systematic finger attacks that were part of samurai close-combat training
Common Mistakes
!Grabbing multiple fingers — effective finger locks target one or two digits, not the whole hand
!Applying with a jerking motion — finger locks must be smooth and controlled; jerking causes fractures before the partner can respond
!Using finger locks against closed fists — the fingers must be extended or gripping to be vulnerable; a closed fist protects the fingers
!Not controlling the opponent's wrist — the wrist must be stabilised while the fingers are manipulated; a free wrist allows escape
!Attempting in gi competition — finger locks are illegal in IBJJF and most gi competitions; use them only where rules allow
!Bending fingers in the natural direction — finger locks attack against the natural range; bending with the joint creates no submission
!Not training tap recognition — because finger locks work so fast, the attacker must be hyper-alert to the partner's tap signal
Related Techniques
Counter Techniques
Setup Chain
1Establish Position — achieve the controlling position needed for this submission
2Create the Threat — begin the submission setup to force a defensive reaction
3Secure the Hold — lock the submission grip with proper body mechanics
4Finish — apply increasing pressure until the opponent taps or the joint/choke takes effect
Sources & References
Primary Source
Daito-ryu Aiki-jujutsu / Aikido
1BookDaito-ryu Aiki-jujutsu / Aikido
Japanese terminology sourced from Daito-ryu Aiki-jujutsu / Aikido
2Oral TraditionDaito-ryu Aiki-jujutsu
Classical aiki-jujutsu tradition
3SyllabusAikido Terminology
Aikido technique naming conventions
Standard Japanese martial arts terminology (kanji/hiragana)
5OtherJapanese Martial Arts Standard Terminology (武道用語)
Established Japanese martial arts naming convention — native Japanese term (和語/漢語)
6CitationDaito-ryu Aiki-jujutsu / Aikido
Japanese terminology sourced from Daito-ryu Aiki-jujutsu / Aikido
Community
Athletics
Requires
grip strength, joint isolation ability, positional control
Favours
strong forearms and stable base
Key muscles
forearm flexors, core stabilisers, hip muscles for base
Notes
Finger locks (small joint manipulation) are banned in virtually all grappling and MMA competition — IBJJF, IJF, ADCC, and Unified MMA rules all prohibit attacks on individual fingers. Legal only in some self-defense and military combatives contexts. (IBJJF Rules v6.0; Unified Rules of MMA; IJF Rules)
Frequently Asked Questions
How do I start a finger lock from a wrist grab?
From a wrist grab, reach over your opponent's grip and target the pinky finger. Place your fingers at the joint of the pinky and create a base with your other hand while applying pressure to the pinky.
Can I lock multiple fingers at once?
Yes. Once you control the pinky, you can expand to grab the three fingers alongside it, controlling multiple finger joints simultaneously for greater control.
What positions can I transition to from a finger lock?
From a finger lock you can drive the fingers upward to an Aikido position called IQ where you control the arm at a 90-degree angle, or transition into a hammer lock by driving your hand into the crook of the elbow and controlling the opponent's elbow against your chest.
How does the Finger Locks work?
Finger locks are small-joint manipulation techniques that isolate and hyperextend, hyperflex, or laterally deviate one or more fingers beyond their anatomical range. Techniques include single-finger hyperextension, thumb locks, finger peeling (breaking grip by bending back fingers), and multi-finger bending attacks.
Where does the Finger Locks come from?
Finger manipulation techniques (yubi-waza) are extensively documented in Daito-ryū Aiki-jūjutsu, where they form part of the art's comprehensive joint-control curriculum. In Aikido, finger techniques (yubi-dori) are practiced as part of weapon-disarming and control sequences.
Is the Finger Locks legal in competition?
IBJJF: banned — Small joint manipulation prohibited at all belt levels; IJF: banned — Prohibited; ADCC: banned — Small joint manipulation prohibited; Unified MMA: banned — Small joint manipulation is a prohibited foul; FIAS Sport Sambo: banned — Prohibited; FIAS Combat Sambo: banned — Prohibited
How dangerous is the Finger Locks?
Danger rating 5/10. Finger locks isolate individual digits; dislocations are the primary risk
How do I set up the Finger Locks?
The standard setup chain: Establish Position → Create the Threat → Secure the Hold → Finish.
How do I defend against the Finger Locks?
Standard counters include: Early Recognition — identify the submission attempt early and begin defence immediately / Posture and Base — maintain strong posture and base to prevent submission setups / Grip Fight — deny the attacker their preferred gripping configuration.
What are the variants of the Finger Locks?
Common variants: Standard variation (primary grip configuration and finishing angle); Gi variation (using the gi material for grip assistance and control); No-gi variation (adapted grips for submission grappling without the gi); Transition variation (applied during a positional change or scramble).
How effective is the Finger Locks in competition?
Finger locks are generally banned in BJJ competition (IBJJF) but legal in some submission grappling and MMA events.
What are common mistakes when doing the Finger Locks?
Top errors to watch for: Grabbing multiple fingers — effective finger locks target one or two digits, not the whole hand / Applying with a jerking motion — finger locks must be smooth and controlled; jerking causes fractures before the part… / Using finger locks against closed fists — the fingers must be extended or gripping to be vulnerable; a closed fist pr… / Not controlling the opponent's wrist — the wrist must be stabilised while the fingers are manipulated; a free wrist a….
What are other names for the Finger Locks?
The Finger Locks is also known as Yubi Kansetsu-waza, Yubi-kansetsu-waza, Finger Joint Lock, Small Joint Lock.