The straight ankle lock is a standard leglock that dislocates the ankle
|Parent style||Shoot wrestling, Sambo, Brazilian Jiu-Jitsu, Catch wrestling, Judo|
A leglock is a joint lock that is directed at joints of the leg such as the ankle, knee or hip joint. 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, mixed martial arts, Shootwrestling and submission wrestling, but are banned in some sports featuring joint locks such as judo.
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. 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.
A kneebar (also known as a straight legbar) 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.
Ankle lock 
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. 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 
The straight ankle lock (depending on how it is performed also known as an achilles lock or ashi-hishigi in judo) 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".
Toe hold 
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. 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 
A heel hook is a leg lock affecting multiple joints, and is applied by transversely twisting the foot either medially or laterally. The torsional force puts severe torque on the ankle, which in turn transfers torque to the knee. The heel hook is generally considered to be a very dangerous leg lock, with a high rate of injury, especially to ligaments in the knee. It was subsequently banned in many combat sports featuring other leg locks such as Brazilian jiu-jitsu and Sambo. The heel hook is however an allowed technique in some submission wrestling and mixed martial arts competitions.
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.
Calf Lock 
A Calf Lock, otherwise known as Calf Crush, Knee Pinch, Calf Slice, Calf Cutter, Knee Distruction, or Knee Implosion, is a technique wherein you compress the leg (heel to butt) while placing a limb immediately behind the knee. The limb can be a wrist, forearm, calf, or ankle. Calf Locks are not new techniques. Its popularity has recently become more noticeable since they are not frequently practiced or emphasized by current martial arts. Calf Locks are serious techniques which can cause serious injuries to the calf and knee, and caution should be a priority when finishing the lock.
See also 
- For leglocks involving a separating motion of the knee, see Leg slicer.
- Small joint manipulation
- Spinal lock
- Compression lock
Main references 
- Bison Grappling. Heel hook. bisons.net. URL last accessed February 5, 2006.
- Gotch, Frank. The toe hold. gnarlmaster.tripod.com. URL last accessed February 5, 2006.
- Kesting, Stephan. Breaking down the Ankle Lock, Kneebar Mastery: Fixing the Most Common Mistakes. www.grapplearts.com. URL last accessed February 5, 2006.
- Pearson, Charlie. Heel hook. www.lockflow.org. URL last accessed February 4, 2006.
- Riccaldi, Alain. Catch Wrestling Leg Locks. www.fightordie.it. URL last accessed February 5, 2006. (In Italian)
- Trnka, Tue. MMA-ordbogen. www.mmareporter.dk. URL last accessed February 5, 2006. (In Danish)
- Judo Leg Locks. Leg locks
Other references 
- International Judo Federation. IJF Referee Rules. www.ijf.org. URL last accessed January 7, 2006.
- International Brazilian Jiu-jitsu Federation (for beginners, not advanced practitioners). Rules. www.cbjj.com.br. URL last accessed February 5, 2006
- Amateur Athletic Union. SOMBO competition. www.aausports.org. URL last accessed February 4, 2006.
|Wikimedia Commons has media related to: Leglock|
Kneebar instructions 
- Knee Bar. Basic knee bar.
- Foot Pull Knee Bar. Kneebar from the half guard position.
- Kneebar Leglock Q & A. Information about common problems in performing kneebars.
- Rolling Kneebar From Tie Up
Ankle lock instructions 
- Achilles Lock. Basic straight ankle lock.
- Quasimodo Shin Lock. An ankle lock that can be performed from the top in the guard.
- Figure 4 Toe Hold. Basic toe hold.
- Knee Crush Toe Hold. A toe hold from the top in the guard
- Tyrone Glover's Toe Hold.
Heel hook instructions 
- Clinch to Inside Trip to Heel Hook vs. Punching. Basic heel hook.
- Bicep Grip Heel Hook (sic). Variation of the grip in the heel hook
- Heel Hook. Basic inverted heel hook.
- Ankle Pick To Heel Hook. Another inverted heel hook.
- Heel Hook From Your Opponents Guard Heel hook using the legs.