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A leglock is a joint lock that is directed at joints of the leg such as the ankle, knee or hip joint.[1] A leglock which is directed at joints in the foot is sometimes referred to as a foot lock and a lock at the hip as a hip lock. Leglocks are featured, with various levels of restrictions, in combat sports and martial arts such as Sambo, Brazilian Jiu-Jitsu, catch wrestling,[2] mixed martial arts, Shootwrestling and submission wrestling, but are banned in some sports featuring joint locks such as judo.[3][4][5] The technique has been seen across a wide range of different combat sports and is reportedly over 2,500 years old, having been seen in the lost art of Pankration in the original Olympic Games.[6]

Key Information

As with other jointlocks, leglocks are more effective with full body leverage. Some attack the large joints of the knee or hip and involve utilizing leverage to counteract the larger muscle groups, while others directly attack ligaments in the knee or the smaller joint of the ankle. Leglocks can involve control positions such as the inside leg triangle or leg knot to maintain control while applying the attack or transitioning between two attacks, though they and some other control positions are banned in Brazilian Jiu-jitsu competition. Some other leglock control positions have been adopted into modern BJJ and submission grappling competitions as "guards" such as the snake guard, one-legged X-guard, and 50/50 Guard, where they are used for both leglocks and to reverse into dominant positions from the bottom.

In training or sparring, leglocks are applied in a slow and controlled manner, and are often not hyperextended such as in the case of the comparatively dangerous heel hook.[7] Instead, submission is signalled before the lock is fully applied. In self-defense application, or when applied improperly or with excessive force, leglocks can cause muscle, tendon and ligament damage, even dislocation or bone fractures.

Some examples of the many types of leglocks are found below.

Kneebar

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See also: Ashi garami
"Knee bar" redirects here. For the automotive safety device, see Airbag § As a substitute for seat belts.
A kneebar is performed on the leg similarly to how the armbar is performed on the arm.

A kneebar (also known as legbar, kneelock or hiza-juji-gatame) is a leglock that can hyperextend the knee. The basic kneebar technique is similar to that of an armbar. The practitioner will trap the opponent's leg in between their legs and secure the leg with their arms so the opponent's kneecap points towards the body. The practitioner then applies pressure with their hips, forcing the opponent's leg to straighten, hyperextending the knee joint. A variation of the kneebar is similarly accomplished, but instead of holding the leg with the hands, the practitioner will trap the opponent's foot behind one armpit. The practitioner will then apply pressure using their upper body as well and their hips, yielding a greater amount of force applied to the knee, therefore rendering the lock much more difficult to escape before tissue or ligament damage occurs.[8] Alternatively, if the practitioner is gripping low enough with both hands on the ankle and calf/shin of the opponent, the practitioner can cross one leg over and use it to press down as a leg triangle around the opponent's knee/thigh/patella/femur, making the hold more secure and allowing the practitioner to strike the opponent's groin or pin down/push away the opponent's other leg with the practitioner's non-crossed leg.

A variation of the kneebar known as the Suloev Stretch arises from the back control position, often as the opponent stands with one or both hands on the mat, thus placing their ankle within reach.[9] The opponent's ankle is pulled toward his own shoulder, effecting a tearing pressure on the hamstring of the isolated leg, hyper-extending the knee, and applying rotational pressure to the hip joint.[9]

Ankle lock

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An ankle lock (occasionally referred to as a shin lock) is a leglock that is applied to any of the joints in the ankle, typically by hyperextending the talocrural joint through plantar hyperflexion.[10] Ankle locks are often applied in a manner which simultaneously causes a compression lock to the achilles tendon, and sometimes also to the calf muscle.

Straight ankle lock

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Further information: Ashi-Hishigi and Achilles lock

The straight ankle lock (depending on how it is performed is known in judo as an akiresuken-gatame or ashi-hishigi) is what is usually thought of as an ankle lock. It is typically performed using the legs to isolate one of the opponent's legs, and placing the opponent's foot in the armpit, while holding the foot with the forearm at the lower part of the opponent's calf, usually at the achilles tendon. By leveraging the hips forward, the foot becomes forcefully plantar flexed, hence creating a potent joint lock on the ankle. The forearm serves as a fulcrum in the leveraging, and may cause severe pressure on the achilles tendon, especially when the bony parts of the forearm are used. Such a straight ankle lock is sometimes referred to as an "achilles lock".

A figure-four toe hold.

Toe hold

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A toe hold (also known as ashi-dori-garami in judo) involves using the hands to hyperextend and/or hyperrotate the ankle, typically by grabbing the foot near the toes, and twisting or pushing the foot while controlling the opponent's leg.[11] A common type of toe hold is the figure-four toe hold, where a figure-four hold is used to hold the opponent's foot. This type of toe hold is performed by holding the foot by the toes with one hand, and putting the other hand under the opponent's achilles tendon, and grabbing the wrist. By controlling the opponent's body, and using the hands to plantar flex the foot either straight or slightly sideways, hence putting considerable torque on the ankle. The toe hold can also be applied in a similar position as an ankle lock.

Heel hook

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The regular heel hook twists the ankle medially. The opponent's leg is entangled to prevent him from escaping the hold.

A heel hook is a leg lock affecting multiple joints, and is applied by transversely twisting the foot either medially or laterally.[12] The torsional force puts severe torque on the ankle, which in turn transfers torque to the knee.

There are several variations of heel hooks, with the most typical being performed by placing the legs around a leg of an opponent, and holding the opponent's foot in the armpit on the same side. The legs are used to control the movement of the opponent's body while the opponent's foot is twisted by holding the heel with the forearm, and using the whole body to generate a twisting motion, hence creating severe medial torque on the ankle. A similar heel hook can be performed by holding the opponent's foot in the opposite armpit, and twisting it laterally; a move which is referred to as an inverted, reverse or inside heel hook.

Many practitioners considered the heel hook to be a dangerous leg lock, with a high rate of injury,[13] especially to ligaments in the knee. As a result, many popular figures in the grappling world do not believe that heel hooks should be taught to beginners.[14] Despite being a very old technique,[15] the heel hook is illegal in many forms of competitive grappling and was at one point completely banned in Brazilian jiu-jitsu under IBJJF rules, but this was changed for advanced competitors as of 2021.[16] Today there are several exceptions to this, most notably the advanced categories of competition Brazilian jiu-jitsu[17] and Sambo.[18]

Calf crush

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A calf crush or calf slicer (also known as calf cutter, knee slicer, or knee separator), known in judo as hiza-hishigi, is a technique wherein one compresses their opponent's leg (heel to butt) while placing one's forearm or shin behind the knee to crush the calf muscle while potentially separating the knee joint. As with biceps slicers, there is a common misconception that this technique causes only pain. Calf locks can cause very serious injuries to the knee as well as damaging the calf muscle, and caution should be a priority when finishing the lock.

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Leglock

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A leglock is a submission technique in that targets the joints of the lower body, primarily the ankle, , or , using leverage from the entire body to control, hyperextend, or torque the opponent's leg, often compromising ligaments and muscles. Common in (BJJ), , and submission grappling, leglocks encompass various forms such as the straight ankle lock, which flexes the foot to attack the ; the kneebar, which hyperextends the joint akin to an armbar; the toe hold, which twists the ankle for hyper-rotation; the heel hook, which applies transverse torque to the and ankle; and the calf slicer or crush, which compresses the calf muscle to pressure the . These techniques are executed from specialized positions like (leg entanglement), where the practitioner's legs isolate one of the opponent's for attack; 50/50 guard, involving mutual leg entanglement; or the saddle position for bilateral control. Historically, leglocks originated in ancient combat systems such as Greek and Japanese samurai arts, evolving through modern disciplines like in the late 19th century and Soviet sambo, before becoming a core element of BJJ through pioneers like Helio Gracie, who used them for control and submission, and , who expanded their tactical application. Once marginalized in BJJ due to injury risks and rule restrictions, leglocks experienced a resurgence in the late 20th and early 21st centuries, driven by figures like , who dominated with them in ADCC competitions, and , who integrated them into rubber guard systems, culminating in widespread adoption via John Danaher's instructional frameworks emphasizing safe, precise entries. In competitions governed by the (IBJJF), leglock legality varies by belt level and format: white belts are restricted to straight ankle locks in both gi and no-gi; blue and purple belts may add toe holds and kneebars in no-gi but remain limited in gi; while brown and black belts have full access, including heel hooks in no-gi since 2021. Their strategic value lies in disrupting an opponent's base, facilitating transitions to other attacks, and providing an alternative to upper-body submissions, making proficiency in leglocks essential for well-rounded grapplers in both sport and self-defense contexts.

Overview

Definition and Principles

A leglock is a type of submission hold in that targets the joints of the lower extremities, primarily the ankle, , or hip, by applying hyperextension, compression, or torsional forces to induce pain and compel an opponent to submit or "tap out." These holds exploit the structural vulnerabilities of the leg's joints and ligaments, distinguishing them from strikes or chokes by focusing on mechanical isolation rather than direct impact or vascular restriction. Biomechanically, leglocks rely on leverage generated from the practitioner's hips, core, and upper body to isolate the targeted , often through control positions such as leg entanglements or guard passes that restrict the opponent's mobility and prevent defensive postures. This isolation amplifies pressure on the joint by aligning the body in ways that multiply force, such as using the practitioner's body weight against the opponent's limb to exceed the joint's natural . Key to this process is the figure-four grip configuration, where the arms or legs interlock to create a , channeling or extension directly to the joint without requiring excessive strength. Leglocks differ from armlocks in their extended range and inherent vulnerability, as the legs comprise a larger portion of the body's and are less neurologically sensitive, potentially leading to higher thresholds but also greater risk of severe damage if misapplied. Understanding prerequisite anatomy is essential: the , stabilized by ligaments including the (ACL), posterior cruciate ligament (PCL), (MCL), and lateral collateral ligament (LCL), is susceptible to hyperextension or valgus/varus stresses; similarly, the ankle's syndesmosis—comprising the anterior inferior tibiofibular , posterior inferior tibiofibular , and interosseous —binds the and , making it prone to torsional or compressive injuries. These anatomical features underpin the universal mechanics of leglocks across variations, emphasizing precise control to avoid unintended harm.

History and Development

Leglocks, as joint manipulation techniques targeting the lower body, trace their origins to ancient combat sports over 2,500 years ago. In ancient Greece, pankration—an unarmed fighting discipline introduced to the Olympic Games in 648 BC—incorporated submissions including leg locks, blending elements of wrestling and boxing with holds designed to immobilize opponents. Archaeological evidence and literary descriptions from the era depict fighters applying torque to limbs, with leg entanglements evident in vase paintings and texts by authors like Pausanias, highlighting their role in decisive finishes during competitions. Similarly, in the , wrestling, a tradition evolving from ancient practices described in epics like the (circa 400 BCE–400 CE), featured a range of submission holds, including leg locks, pins, and joint manipulations as core techniques for subduing adversaries in akharas (wrestling pits). These methods emphasized ground control and limb control, influenced by Persian koshti during the Mughal era (16th–19th centuries), where wrestlers trained in dangs (tournaments) to apply locks targeting knees and ankles for victory. During the medieval and early modern periods, leglocks persisted in European and Asian grappling systems. , emerging in 19th-century , , as a competitive folk style derived from Lancashire wrestling and , prominently featured leg locks like the figure-four and heel hook for submissions in carnival challenges and carnivals. In feudal (12th–19th centuries), schools developed for battlefield use incorporated leg locks as part of atemi-waza (striking) and kansetsu-waza (joint techniques), with manuals from ryuha like Takenouchi-ryu illustrating ashigarami (leg entanglements) for disarming armored foes, predating 's formalization. Precursors to judo, such as these classical systems, emphasized standing applications of leg locks to disrupt mobility in combat. The marked the global spread of leglocks through synthesized . In the , sambo—developed in the 1920s and formalized by the 1930s under and —integrated leg locks from , folk wrestling, and international styles, allowing techniques like the kneebar and ankle lock that had been banned in competitions since the early , particularly twisting leg locks from 1916. This inclusion was notable as had banned certain leg locks, such as , in 1916 following injuries in early competitions. emerged in the early 1900s when , a Kodokan judoka, immigrated to in and taught principles, including leg entanglements, to , who adapted them into a system emphasizing , though early Gracie academies initially de-emphasized lower-body attacks in favor of upper-body submissions. Leglocks also appeared in freestyle wrestling's evolution, with early 20th-century international rules permitting leg takedowns and controls that influenced submission variants in no-rules catch-as-catch-can bouts. Key figures propelled leglocks' prominence in the mid-20th century. , a Belgian catch wrestler active from the , trained under at in the and promoted leg-intensive submissions through international tours and matches, influencing Japanese pro wrestling in the 1970s by teaching strong-style techniques to figures like , which blended catch holds with for realistic fights. The rise of in the 1990s, particularly through the Ultimate Fighting Championship's debut in 1993, showcased leglocks in open-weight tournaments; Ken Shamrock's heel hook submission of Patrick Smith at demonstrated their efficacy in no-holds-barred contexts, accelerating adoption as fighters cross-trained in sambo and . Over time, leglock applications evolved from primarily standing counters in traditional wrestling to specialized ground-based attacks in no-gi . This shift, evident by the late 20th century, prioritized entanglements like for isolating limbs on the mat, driven by influence and the demands of gi-less competitions where frictionless surfaces favored control-oriented leg positions over upright clinches.

Applications and Legality

Use in Martial Arts and Combat Sports

Leglocks hold a central role in several and combat sports, particularly as primary submission techniques in (BJJ), sambo, and , where they are employed to target the lower body's joints and ligaments for control and finishes. In BJJ, especially no-gi variants, leglocks have evolved from peripheral tools to essential components of modern strategies, allowing practitioners to attack from dynamic positions like to disrupt opponents' balance and force taps. Sambo, a Russian hybrid art blending and wrestling, emphasizes leglocks as core elements, often integrating them into standing transitions and ground control to exploit vulnerabilities in prone or turtled positions. , the foundational influence on many submission styles, defines itself through aggressive leglock applications, using them to crank joints in ways that prioritize pain compliance over prolonged control. In contrast, leglocks serve secondary but increasingly vital functions in (MMA) and pure submission , where they complement striking and upper-body submissions by providing quick finishes against resistant foes. Strategically, leglocks function as versatile finishing moves, enabling attacks from both bottom positions—such as open guard or single-leg entanglements—to invert and isolate limbs, or from top control after passing to the legs for direct exposure. They also act as effective counters to takedowns, transforming failed shots into leg entanglements that reverse momentum and threaten immediate submissions, a tactic refined in high-level no-gi environments. In major tournaments like the ADCC World Championships, leglocks, particularly heel hooks, consistently rank among the top submission types, comprising around 10-15% of finishes in recent events and highlighting their reliability in elite competition. In competitive contexts, leglocks shine in no-gi submission events such as ADCC, where their speed and accessibility make them a staple for specialists navigating open-weight and division brackets. Notable examples include ' heel hook victories in MMA, which underscored leglocks' devastating potential in hybrid fights, and Gordon Ryan's systematic leglock chains in ADCC, turning defensive scrambles into dominant finishes. Modern trends show a surge in leglock proficiency across demographics, with women's divisions in BJJ and grappling exhibiting higher submission rates—up to 37% in ADCC female brackets—driven by athletes like Elisabeth Clay, whose leglock finishes against top competition leverage enhanced flexibility for rapid attacks. In lighter weight classes, the technique's reliance on leverage over brute strength amplifies its effectiveness, allowing smaller grapplers to neutralize larger opponents through precise entries. Culturally, leglocks influence hybrid styles like Combat Sambo, where they blend with striking for comprehensive ground dominance, and , Brazil's no-gi wrestling tradition that incorporates them as key submissions in street-oriented fights.

Rules and Regulations

In gi competitions governed by the (IJF), and ankle locks are prohibited for all competitors, with ne-waza joint techniques limited exclusively to locks to minimize risk. Similarly, in (BJJ) gi competitions under the (IBJJF), reaping—the positioning of one leg across an opponent's to isolate the lower body—was banned until 2021 across all divisions due to concerns over damage. Organization-specific rules vary significantly. The IBJJF previously deemed heel hooks illegal in all divisions prior to 2021, but now permits them, along with other twisting leg submissions, exclusively for adult brown and black belt competitors in no-gi events. In contrast, the Combat Club (ADCC), a premier no-gi tournament, allows all forms of leglocks, including heel hooks, armbars, and ankle locks, without belt restrictions for adult professionals to encourage comprehensive submission . In (MMA) under the Unified Rules adopted by the (UFC), leg submissions face no outright bans, though referees exercise discretion to stop potentially dangerous applications, such as those involving or excessive torque. Recent developments reflect evolving safety standards and competitive demands. The IBJJF's 2021 rule update legalized heel hooks and in advanced no- divisions to align with modern trends, effective from January 1, 2021, while maintaining stricter limits in gi to preserve traditional elements. In amateur wrestling overseen by (UWW, formerly ), debates continue over leglock prohibitions, with joint locks banned entirely below college level in many national federations to protect younger athletes, though freestyle rules permit leg-based takedowns without submission holds. Rules often differ by belt rank, age group, and uniform type to prioritize . In IBJJF events, white belts are restricted to straight ankle locks only, with knee bars and toe holds permitted from belt onward, and heel hooks reserved for and belts; and junior divisions impose even tighter limits, prohibiting most leg attacks to prevent developmental injuries. Gi competitions generally enforce broader prohibitions on and twisting submissions compared to no-gi, where friction from clothing reduces some risks, allowing earlier access to advanced techniques in organizations like the IBJJF. Global inconsistencies highlight cultural and regulatory variances. Leglocks, including straight ankle and knee bars, are permitted in sport sambo tournaments under the International Sambo Federation (FIAS), though heel hooks and toe holds remain illegal to balance aggression with safety; in contrast, Olympic modifies rules to exclude most leg submissions, focusing on throws and armlocks amid ongoing IJF reforms.

Types of Leglocks

Kneebar

The kneebar is a straight hyperextension lock targeting the joint, achieved by isolating the opponent's lower leg while using their as a fulcrum to apply against the posterior ligaments such as the ACL and PCL. This mechanic creates pressure on the posterior structures, forcing hyperextension beyond the joint's natural range, similar to how an armbar isolates and extends the . The technique requires precise control to prevent the opponent from rolling or countering, with the attacker's legs clamping tightly around the isolated to maintain leverage. Entries into the kneebar typically begin from dominant positions like the closed guard, where the attacker steps over the opponent's leg to isolate it, or from the turtle position, using a quick and leg entanglement to transition into the setup. From the single-leg X guard, the attacker can elevate the leg and rotate to secure the figure-four grip around the targeted thigh, facilitating the step-over motion for isolation. These setups emphasize speed and grip dominance to bypass the opponent's defenses before they can posture up or sprawl. Variations of the kneebar include the traditional straight application, executed with the opponent's leg extended across the attacker's torso, and the Suloev stretch, a dynamic variant from back control that incorporates a figure-four leg wrap to pull the while hyperextending the . To finish, the attacker drives the hips forward while arching the back and elevating the isolated foot, intensifying the extension through rotational . A common escape is stacking, where the opponent folds their body over the to compress the and relieve pressure, often requiring the attacker to adjust grips to counter. The kneebar's similarity to the armbar lies in its linear force application, but it carries unique risks due to the leg's greater mass and structural complexity, potentially leading to more severe tears if improperly applied or defended.

Straight Ankle Lock

The straight ankle lock, also known as the Achilles lock or botinha, is a compression-based submission that applies pressure to the and through dorsiflexion of the foot, without any rotational . The attacker secures a figure-four grip by wrapping their around the opponent's ankle, with the bicep cupping the and the forearm pressing against the , while the opposite locks the wrist to form the figure-four configuration. This setup isolates the ankle for linear hyperextension, targeting the tendon's vulnerability to compression against the . Common entries into the straight ankle lock often begin from leg entanglements such as the position, where the attacker sits back to off-balance the opponent and weave their to control the target limb, or from the 50/50 guard by isolating the ankle during mutual leg entanglement. Setups can also originate from the saddle mount, achieved by passing to a north-south position and then circling to trap the , or through a leg weave from open guard to transition into the grip. These entries emphasize controlling the opponent's posture and hips to prevent escapes while isolating the lower . Variations of the straight ankle lock include the tendon-focused Achilles lock, which prioritizes direct compression on the Achilles by arching the attacker's back, and the basic straight ankle, which maintains a neutral position for simplicity. An Americana-style variation incorporates control similar to the arm submission, enhancing leverage by torquing the opponent's arm to assist in the ankle isolation and finish. These adaptations allow for adjustments based on or no-gi contexts and the opponent's resistance. To finish the submission, the attacker squeezes their arms together while driving the hips forward and upward, increasing dorsiflexion to hyper-extend the ankle and compress the against the shin, often prompting a tap from in the or . Defenses typically involve heel escaping by pulling the foot away, framing the opponent's with the free hand, or bridging the hips to disrupt the grip. The technique's effectiveness relies on maintaining control of the opponent's far leg to prevent counterattacks. The straight ankle lock is notable for its legality at all belt levels in many competitions under IBJJF rules (with restrictions for white belts in some cases) and is a staple in sambo curricula, where leg submissions are emphasized from early training. It forms a foundational element in BJJ white belt programs, promoting safe introduction to leg locks due to its linear mechanics and lower risk of rotational injury compared to twisting variants.

Toe Hold

The toe hold is a rotational ankle lock submission in Brazilian jiu-jitsu (BJJ) and other grappling arts, executed by isolating and torquing the opponent's foot to apply external rotation stress to the ankle joint. It primarily targets the lateral ligaments of the ankle, such as the anterior talofibular ligament (ATFL) and calcaneofibular ligament (CFL), through a figure-four grip that wraps around the toes and heel, creating torque that can lead to hyperextension or inversion of the foot. This mechanic distinguishes it from straight ankle locks, which rely on linear compression rather than rotational force, and it requires precise control to avoid unintended pressure on the knee. Entries into the toe hold often begin from leg entanglement positions like , where the attacker threads their arm under the opponent's to secure the foot, or from guards such as de la Riva or inside sankaku, allowing access to the non-hooking . A common setup involves transitioning from a failed straight ankle lock attempt, where the defender pushes the foot away, enabling the attacker to capture the toes instead; alternatively, from top positions like or , the attacker can isolate the by underhooking the and sliding to secure the figure-four grip. These setups demand high control to prevent escapes, as the opponent may counter by tucking the foot or bending the to reduce leverage. Variations of the toe hold include the basic form applied from inside , the inverted or reverse toe hold from outside positions like rear ashi, and combinations that incorporate knee pressure for added torque, such as the north-south toe hold from mount transitions. In the inverted variation, the attacker positions themselves outside the leg to access the foot from an unconventional angle, often chaining into a kneebar if the opponent defends by straightening the leg. These adaptations enhance its versatility in both and no-gi environments, though they all emphasize isolating the toes to maximize rotational isolation. To finish the toe hold, the attacker secures the figure-four lock—one hand gripping the toes while the other reinforces at the wrist or heel—then applies a twisting motion by curling the toes inward and pulling the foot toward the opponent's buttock, often using the elbow to press down on the heel for leverage. This generates sharp in the ankle ligaments, prompting a tap, but requires the attacker's body weight to maintain isolation against counters like foot tucking. The technique's high control demands make it particularly effective when chained from other leg attacks, as it exploits defensive reactions while minimizing escape windows.

Heel Hook

The heel hook is a rotational leglock submission in and other arts that applies torque to the and joints primarily through internal or external rotation of the , with secondary effects on the ankle. This mechanic involves securing the opponent's with one hand while controlling the or with the other, then twisting the foot to generate transverse force that stresses the ligaments, such as the ACL and PCL, and potentially the capsule. The submission's danger stems from its multi-joint involvement, where the rotational pressure can cause tears in ligaments or without immediate visible signs of distress. Entries into the heel hook typically begin with leg entanglements to isolate the target , such as outside , where the attacker wraps one leg over the opponent's and underhooks the far leg for control. From the truck position, the attacker sits perpendicular to the opponent with legs framing the hips, transitioning by pulling the heel into grip while blocking escapes. Back takes also serve as setups, where control from the opponent's back allows a switch to leg entanglement by threading the under the leg and securing the heel during a scramble. Variations of the hook include the standard outside version, which rotates the laterally from a side-on position, and the inside (or reverse) hook, which applies medial rotation and is considered more damaging due to greater torque on the inner structures. The inverted hook, often executed from bottom positions like 50/50 guard, inverts the attacker's body to grip and twist the while using legs to lock the hips. The Russian variation modifies the standard by keeping the knees together for a tighter entry, enhancing control in no-gi scenarios. To finish, the attacker slowly builds torque by rotating their body away from the gripped , using the free to press against the opponent's and flare the open for maximum , often clasping hands for a secure grip. Defenses emphasize rapid action, such as performing a 360-degree spin to align the body and release the entanglement, or immediately to avoid escalation, as delayed responses can lead to hidden micro-tears that accumulate into chronic issues. The heel hook's high injury rate arises from its capacity for insidious damage, where rotational force can rupture knee ligaments or with minimal outward signs, leading to long-term if not addressed. In 2021, the IBJJF legalized heel hooks for adult brown and black belts in no-gi divisions, shifting the competitive meta toward earlier leg entanglements and increased leglock threats during guard passing, while prompting broader training in defenses to mitigate risks across all levels.

Calf Slicer

The calf slicer is a compression-based leglock that applies intense pressure to the calf muscle by wedging the attacker's shin against the opponent's lower , folding the to pinch the peroneal nerve and strain the capsule, thereby creating a severe crushing sensation rather than targeting hyperextension. Unlike the straight ankle lock, which isolates and torques the ankle , or the kneebar, which straightens the to overextend the , the calf slicer emphasizes compression in the calf area. This technique risks muscle tears or damage if not released promptly, making it particularly painful due to the nerve involvement. Entries into the calf slicer often begin from positional control, such as the north-south position where the attacker threads a hook around the opponent's leg from a turtle guard and pulls the toes downward to isolate the limb, or from a reverse armbar setup where the opponent defends by turning away, allowing the attacker to transition by figure-fouring the legs over the target leg. A common leg fold-over entry occurs from the truck position, where the attacker drops their shin behind the knee while securing the foot and rolling to compress the calf. These setups prioritize isolating one leg while maintaining upper body control to prevent counters. Variations of the calf slicer include ground-based applications, such as from or where the shin wedges into the calf before forming a leg triangle, and standing versions seen occasionally in MMA, where the attacker lifts and folds the leg against their own body for leverage. An adaptation from , known as the knee separator, modifies the technique by using forearm pressure instead of the shin to separate the while compressing the calf, often in standing or clinch scenarios. To finish the hold, the attacker squeezes their own shin into the calf while controlling the opponent's hips with their arms or to prevent rotation, often pulling the foot downward with a gable grip or instep control for added . Effective escapes involve bridging the hips upward to create space or extending the trapped forward to relieve the compression, though timing is critical to avoid escalation. The calf slicer remains less common in competition due to its high pain threshold, which prompts quick taps but deters aggressive pursuit, and it is banned in some gi rulesets for lower belts as it can constitute reaping by crossing the knee line.

Risks and Training

Common Injuries and Prevention

Leglocks in martial arts such as Brazilian jiu-jitsu (BJJ) and submission grappling pose significant risks to the lower extremities, primarily due to the torque, hyperextension, and compression applied to joints like the knee and ankle. Common injuries include tears to knee ligaments, such as the anterior cruciate ligament (ACL) and medial collateral ligament (MCL), often resulting from rotational forces in heel hooks or hyperextension in kneebars. For instance, a heel hook can directly cause ACL rupture by stressing the knee in a flexed and internally rotated position. Ankle sprains and fractures are also prevalent, particularly from straight ankle locks that force dorsiflexion beyond normal limits, leading to ligament damage or bone stress. Nerve damage, including to the peroneal nerve, may occur from compressive techniques like calf slicers, which apply pressure near the fibular head and can result in temporary or prolonged neuropathy manifesting as foot drop or sensory loss. Long-term complications, such as post-traumatic arthritis, frequently develop following these ligamentous injuries, as joint instability accelerates cartilage degeneration over time. Risk factors exacerbating leglock injuries include rapid application speed, which amplifies before a defender can react; deficits in lower body flexibility, increasing susceptibility to hyperextension; and inadequate warm-up, which leaves muscles and ligaments less resilient to sudden stress. In BJJ, knee injuries affect approximately 25% of practitioners, with a of approximately 0.78 injuries per 1,000 hours of training, and leglocks contribute notably to this rate due to their joint-targeting nature. More recent data from indicate an overall injury incidence of 5.5 per 1,000 hours of training in BJJ. Prevention strategies emphasize immediate recognition of submission threats, such as pre-submission checks during entanglements, and prompt, controlled to avoid escalation. Incorporating leg mobility drills, such as dynamic stretches targeting the hamstrings and ankles, enhances range and reduces injury likelihood, while thorough warm-ups improve tissue pliability. Recovery from leglock-related injuries typically begins with the protocol—rest, ice, compression, and elevation—for the initial 48-72 hours to manage swelling and pain. Mild ankle sprains often resolve in 3-6 weeks with conservative care, though full return to may require 6-12 weeks of progressive rehabilitation to restore strength and . More severe injuries, like ACL tears, demand 6 months or longer for surgical reconstruction and rehab, with focusing on stability exercises. Medical attention should be sought immediately if there is significant swelling, instability, inability to bear weight, or persistent numbness, as these indicate potential fractures or nerve involvement.

Training Methods and Safety

Training leglocks in (BJJ) and other arts begins with foundational techniques that prioritize control and safety, allowing practitioners to build proficiency without excessive risk. For beginners, the straight ankle lock serves as an ideal entry point due to its relative simplicity and lower injury potential compared to rotational submissions. Positional from safe entries, such as starting in positions, helps develop awareness of leg entanglements while limiting full resistance to focus on technique execution. Solo drills, including leg weaves and hip mobility exercises like seated ankle rotations, enhance flexibility and dexterity essential for leglock entries, often performed daily to improve in the hips and ankles. Progression in leglock training follows a structured path, starting with non-rotational locks like the straight ankle lock and kneebar to master basic control mechanics before advancing to more complex submissions. Practitioners typically introduce heel hooks only after achieving competence in foundational positions, particularly post-2021 when the (IBJJF) permitted their use for brown and black belts in adult no-gi divisions, enabling safer integration into competitive curricula. Common pitfalls, such as over-torquing during application, are avoided by emphasizing gradual pressure application and immediate tapping upon discomfort. Advanced training incorporates live rolling with controlled resistance to simulate real scenarios, where chaining submissions—such as transitioning from a kneebar setup to an ankle lock—builds fluidity and adaptability. These sessions often involve partners of similar skill levels to refine entries from guard positions, integrating leglocks into broader flows rather than isolating them. Safety protocols are paramount throughout training, with practitioners instructed to tap early and communicate boundaries to prevent unintended strain. No full-speed applications are permitted for novices, and sessions require coach supervision to monitor form and intervene as needed; protective gear like mouthguards and knee pads is recommended to mitigate incidental impacts. Training partners must establish clear rules beforehand, ensuring mutual respect and progressive intensity. Leglock training integrates seamlessly into overall curricula, with resources like John Danaher's instructional systems emphasizing systematic entry and control to elevate proficiency. Seminars led by experts, such as those from Danaher's New Wave Jiu-Jitsu, provide focused drills and positional to accelerate skill development while reinforcing safety.

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