Cervical Flexion Crank

SubFamily

頸椎屈曲捻り(Keitsui Kukkyoku Hineri)

Traditional

Translation: Cervical Spine Flexion Twist

Overview

Cervical flexion cranks force the opponent's chin toward their chest, compressing the anterior cervical spine and intervertebral discs. ^[1],[2] These cranks are often applied from front headlock positions or top mount, using body weight to drive the head downward. Cervical flexion can also restrict airway by tucking the chin, creating a hybrid choke-crank. ^[3],[4]

Also known as

Neck Flexion Lock^[1]Anterior Cervical Crank^[2]Chin-to-Chest Crank^[3]

Used in

BJJ Judo Submission Grappling MMA Sambo

History & Origin

Flexion-based neck attacks appear in multiple grappling traditions, used in wrestling as control techniques and in jujutsu as finishing submissions. ^{[1],[2],[3],[4]}

Effectiveness

The cervical flexion crank forces the chin toward the chest, compressing the anterior cervical spine. ^[1]

Lineage

Cervical flexion cranks (can opener, neck crank) appear in catch wrestling and early MMA. ^[1]

Competition Record

Cervical flexion cranks are legal in MMA and some grappling events. ^[1]

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Biomechanical Mechanism

Primary Action — Anterior compression of the trachea and airway — direct pressure on the throat restricts breathing and triggers tap

Joints Involved — Cervical spine (flexion under pressure), hyoid bone region, laryngeal cartilage

Force Vector — Posterior-to-anterior force drives the forearm or wrist blade into the throat

Choking Mechanism — Tracheal compression — restricts air flow rather than blood flow, causing sensation of suffocation

Position & Entry

From controlling position — Establish the dominant position, clear defensive grips, thread the choking limb into position

From guard (bottom) — Break the opponent's posture, isolate the neck and configure the choke from underneath

From transition — During a scramble or position change, secure the neck control and lock the choke before the opponent re-establishes defence

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Ratings

Danger Rating

Risk of injury to the person this technique is applied to

Very High8/10

Cervical flexion cranks force the chin toward the chest, compressing the anterior cervical spine

Difficulty

Skill level needed to execute this technique reliably

Advanced

Competition Legality

Whether this technique is allowed under major competition rule sets

Illegal

— IBJJF — Neck cranks and spinal locks prohibited at all be...

IBJJF Rules Book v6.0, June 2024PDF

— IJF — Neck cranks prohibited

IJF Sport and Organisation Rules 2025, Article 27PDF

— FIAS Sport Sambo — All chokes prohibited in Sport Sambo

FIAS International Sambo Competition RulesPDF

Legal

— ADCC — Legal

ADCC Rules Update, April 2025PDF

— Unified MMA — Legal — choke submissions are among the mos...

Unified Rules of MMA, August 2025PDF

— FIAS Combat Sambo — Legal

FIAS Combat Sambo RulesPDF

Training Notes

✓The cervical flexion crank forces the opponent's chin toward their chest — hyperflexing the cervical spine beyond its comfortable range to stress the posterior ligaments and intervertebral discs (Paulson, Shoot Wrestling, 2007)

✓Flexion cranks target the posterior cervical structures: the nuchal ligament, interspinous ligaments, and posterior disc surfaces — the chin-to-chest compression creates pain and structural stress

✓From back control: the forearm across the back of the head drives the chin down — the opponent's neck is forced into maximal flexion while their body is held in place by hooks

✓The can opener is the quintessential cervical flexion crank: from inside closed guard, the attacker laces the hands behind the head and drives the chin to the chest using arm extension

✓Cervical flexion cranks are common in wrestling transitions: the crossface drives the opponent's head in flexion, combining neck control with cervical stress

✓The flexion crank is less dangerous than extension but still carries significant injury risk — disc herniations, ligament sprains, and muscle strains can result from forced flexion

✓In submission grappling, flexion cranks are often used as positional tools rather than submissions: the discomfort forces the opponent to change position, opening other attacks

Common Mistakes

!Using the flexion crank as a finishing technique exclusively — it's often more effective as a positional tool that creates transitions to chokes and armbars

!Applying excessive force in training — flexion cranks can injure the cervical discs and ligaments; use controlled force

!Not differentiating between flexion for control and flexion for submission — control requires moderate pressure; submission requires end-range forcing; know which you're applying

!Cranking from a position without body control — the body must be anchored so the flexion force concentrates on the neck

!Ignoring the opponent's tap or pain signals — flexion cranks cause pain before structural damage; respond to taps immediately

!Applying flexion cranks against opponents with known neck injuries — the cervical spine is cumulative in its injury response; avoid cranks on injured partners

!Not transitioning when the opponent responds — flexion cranks should open other attacks; staying committed to a defended crank wastes position and energy

Related Techniques

Escape — defensive technique to relieve choking pressure and recover position Tap (Submission Signal) — the safety mechanism indicating the technique is effective

Counter Techniques

Tuck Chin — protect the neck by lowering the chin to prevent the choke from sinking Two-on-One Grip Fight — use both hands to strip the choking grip before it locks Turn Into — rotate toward the choking arm to relieve carotid pressure Posture Up — straighten the spine and create distance to break the choking angle

Setup Chain

1Achieve Controlling Position — secure the position from which the choke is applied

2Isolate the Neck — clear defending hands and establish access to the throat

3Set the Grip — lock the choking configuration (arm, lapel, or leg placement)

4Apply Pressure — squeeze to compress the carotid arteries for the finish

Sources & References

Primary Source

Shooto Official Rules — anatomical terminology

1CompetitionShooto Official Rules

Japanese MMA pioneer organization — technique classification

2SyllabusKodokan Judo Institute — Official Waza Names

Standard Japanese martial arts terminology (kanji/hiragana)

3OtherJapanese Martial Arts Standard Terminology (武道用語)

Established Japanese martial arts naming convention — native Japanese term (和語/漢語)

4CitationShooto Official Rules — anatomical terminology

Japanese terminology sourced from Shooto Official Rules — anatomical terminology

Community

Athletics

Requires

grip or squeeze strength, positional control

Favours

strong upper body for sustained compression

Key muscles

forearms, biceps, pectorals, core stabilisers

Sub-techniques

Can Opener

Genus

The can opener is a cervical flexion crank applied from inside the opponent's closed guard by clasping both hands behind the opponent's head and forcefully driving the chin toward the chest. [1,2,3] The attacker interlaces the fingers behind the head and curls the opponent's neck forward, creating intense pressure on the cervical vertebrae and posterior neck muscles. [1,4] While primarily used as a guard-opening technique — forcing the opponent to uncross their ankles due to spine pain — the can opener can also force a tap from pure neck crank pressure. [1,5]

1 species·3 techniquesExplore

Chin Strap Neck Crank

Genus

The chin strap neck crank uses a cupping grip under the opponent's chin to force cervical flexion — driving the chin toward the chest. [1,2] The attacker places one or both hands under the chin in a 'strap' configuration and pushes or pulls the head downward and forward. [1] Unlike the can opener which uses interlaced fingers behind the head, the chin strap applies direct upward pressure under the jaw to flex the neck. [1,3] It is commonly used from top position to break posture or force a submission. [1]

1 species·3 techniquesExplore

Cradle Neck Crank

Genus

The cradle neck crank combines a wrestling cradle — where the attacker links the opponent's head and leg together — with cervical flexion pressure. [1,2,3] The attacker clasps hands connecting the head and knee, then squeezes to fold the opponent, driving the chin toward the knee and creating intense flexion pressure on the cervical spine. [1,4] The cradle position provides exceptional control because the linked head-to-leg connection immobilizes the torso while the cranking force is applied to the neck. [1,5]

3 species·6 techniquesExplore

Frequently Asked Questions

How does the Cervical Flexion Crank work?

Cervical flexion cranks force the opponent's chin toward their chest, compressing the anterior cervical spine and intervertebral discs. These cranks are often applied from front headlock positions or top mount, using body weight to drive the head downward.

Where does the Cervical Flexion Crank come from?

Flexion-based neck attacks appear in multiple grappling traditions, used in wrestling as control techniques and in jujutsu as finishing submissions.

Is the Cervical Flexion Crank legal in competition?

IBJJF: banned — Neck cranks and spinal locks prohibited at all belt levels; IJF: banned — Neck cranks prohibited; ADCC: legal — Legal; Unified MMA: legal — Legal — choke submissions are among the most common finishes in MMA; FIAS Sport Sambo: banned — All chokes prohibited in Sport Sambo; FIAS Combat Sambo: legal — Legal

How dangerous is the Cervical Flexion Crank?

Danger rating 8/10. Cervical flexion cranks force the chin toward the chest, compressing the anterior cervical spine

How do I set up the Cervical Flexion Crank?

The standard setup chain: Achieve Controlling Position → Isolate the Neck → Set the Grip → Apply Pressure.

How do I defend against the Cervical Flexion Crank?

Standard counters include: Tuck Chin — protect the neck by lowering the chin to prevent the choke from sinking / Two-on-One Grip Fight — use both hands to strip the choking grip before it locks / Turn Into — rotate toward the choking arm to relieve carotid pressure / Posture Up — straighten the spine and create distance to break the choking angle.

What are the variants of the Cervical Flexion Crank?

Common variants: Standard grip variation (primary hand configuration for maximum choking pressure); Gi variation (uses the lapel or collar as an anchor for additional fric…); No-gi variation (adapted grip and positioning for submission grappling wit…); Transition finish (applied during a positional change to catch the opponent …).

How effective is the Cervical Flexion Crank in competition?

Cervical flexion cranks are legal in MMA and some grappling events.

What are common mistakes when doing the Cervical Flexion Crank?

Top errors to watch for: Using the flexion crank as a finishing technique exclusively — it's often more effective as a positional tool that cr… / Applying excessive force in training — flexion cranks can injure the cervical discs and ligaments; use controlled force / Not differentiating between flexion for control and flexion for submission — control requires moderate pressure; subm… / Cranking from a position without body control — the body must be anchored so the flexion force concentrates on the neck.

What are other names for the Cervical Flexion Crank?

The Cervical Flexion Crank is also known as Keitsui Kukkyoku Hineri, Neck Flexion Lock, Anterior Cervical Crank, Chin-to-Chest Crank.

cervical flexion crank keitsui kukkyoku hineri submission choke and strangle lock neck crank choke neck flexion lock anterior cervical crank chin to chest crank