Wristlock

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A wristlock is a joint lock primarily affecting the wrist-joint and possibly the radioulnar joints through rotation of the hand. A wristlock is typically applied by grabbing the opponent's hand, and bending and/or twisting it. Wristlocks are very common in martial arts such as Aikido, Hapkido and Jujitsu where they are featured as self-defense techniques. They are also used as submission holds in combat sports such as Brazilian jiu-jitsu and Catch wrestling, while being an illegal technique in Judo^[1] and Sambo^[2] competition. Wristlocks are also used by law enforcement and military as pain compliance holds.

The wristlock is a technique that can be applied from a stand-up position, simply by grabbing the opponent's hand and twisting and/or bending it in a non-natural direction. It is considered to be a relatively safe technique to practice with a willing opponent^[3], but if applied suddenly and/or forcefully, a wristlock can cause ligament tears or possibly even dislocation or bone fractures.

Contents 1 Rotational wristlock 1.1 Supinating wristlock 1.2 Pronating wristlock 2 Hyperflexing wristlock 3 Adductive wristlock 4 See also 5 References 5.1 Main references 5.2 Other references 6 External links

[edit] Rotational wristlock

A rotational wristlock (in Aikido referred to as a type of sankyo, 三教, "3rd teaching")^[4][5]is a very common type of wristlock, and involves forced supination or pronation of the wrist, and is typically applied by grabbing and twisting the hand. The wrist joint does not allow rotating motion, and the force is transferred to the forearm causing radioulnar rotation, eventually resulting in a joint lock on the radioulnar joint. Once the radius and ulna have been brought to their extreme positions, further twisting motion will put severe torque on the wrist. In martial arts, standing rotational wristlocks are often accompanied by the opponent willingly throwing him or herself to escape or alleviate the lock.

[edit] Supinating wristlock

The supinating wristlock (in budo referred to as kote gaeshi, 小手返, "wrist return")^[6][7] is a rotational wristlock, and arguably the most common wristlock. It involves rotating the hand so that it becomes maximally supinated, often referred to as 'externally rotating' the wrist, and hence putting a joint lock on the wrist and radioulnar joint. This can be done by grabbing the opponent's hand with one or both hands, and twisting the hand so that the opponent's thumb points away from the opponent. A supinating wristlock performed from a stand-up position, and can be used to force the opponent to the ground on his or her back. Straightening the arm does not alleviate the pressure, since the shoulder joint does not allow further supination of the hand.

[edit] Pronating wristlock

The pronating wristlock (in budo referred to as kote mawashi, 小手回し, "wrist turn") is similar to the supinating wristlock except that it is reversed in direction, known as 'internally rotating' the wrist. The hand becomes maximally pronated, resulting in a joint lock on the wrist and radioulnar joint. The degree of possible pronation depends on the degree of flexion at the elbow, as a bent elbow inhibits rotation of the humerus. Hence, straightening the arm allows rotation of the whole arm and alleviates the pressure on the joints. The arm has to be additionally twisted until the shoulder joint reaches maximal rotation to preserve the joint lock. This typically results in the arm moving posteriorly, and allows for the complementary technique of pushing the arm at the elbow or shoulder to force the opponent to the ground.

[edit] Hyperflexing wristlock

A hyperflexing wristlock involves forcing the wrist into hyperflexion by pushing or pulling the hand towards the inside of the forearm. A hyperflexing wristlock is often performed in combination with rotational wristlocks, since the hyperflexed hand provides a good lever for twisting, and in addition it increases the overall effectiveness of the wristlock. Hyperflexing wristlocks are often featured as pain compliance techniques, since they allow for good control, and a gradual pain increase if more leverage is added. Hyperflexing wristlocks are also a typical wristlock used as a submission hold.

[edit] Adductive wristlock

An adductive wristlock (in budo referred to as kote hono gaeshi, "partial wrist return", part of aikido's nikkyō, or second teaching)^[1] involves forced ulnar deviation of the hand. It is typically applied by twisting the opponent's arm so that the opponent's palm points laterally and the elbow is slightly bent. The hand is then grabbed using one or both hands, and the wrist is forced downwards, hence reaching the limit of possible ulnar deviation, and creating a potent joint lock on the wrist joint. To avoid damage, it is possible for the opponent to drop down to the ground, and alleviate the pressure. The adductive wristlock is often taught as a self-defence technique against grabbing.

[edit] See also

• Armlock
• Leglock
• Small joint manipulation
• Spinal lock

[edit] References

[edit] Main references

[edit] Other references

[edit] External links

• How to escape a wrist lock? - Part of a how to defend yourself article.
• Omo Plata to wristlock. Shows the omo plata position being used to execute a wristlock.
• Joint locks: The wrist
• Triangle choke, wrist & shoulder lock. Shows a wristlock applied from a triangle choke position.