Joint-locking
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A joint lock is a grappling technique involving manipulation of an opponent's joints in such a way that the joints reach their maximal degree of motion.
In judō these are referred to as, 関節技 kansetsu-waza, "joint locking technique") and in Chinese martial arts as chin na which literally means "catching and locking".
These typically involve isolating a particular joint and lever it in an attempt to force the joint to move past its normal range of motion. Joint locks usually involve varying degrees of pain in the joints and, if applied forcefully and/or suddenly, may cause injury, such as muscle, tendon and ligament damage and even dislocation or bone fracture.
In judo, the combining of standing locks with throws is forbidden due to the risk of physical harm to the falling opponent, while jujutsu, taijutsu, aikido and hapkido allow their use.
Joint locks can be divided into five general types according to which section of the body they affect:
These general types can be further divided into subtypes according to which specific joint(s) they affect, or the type of motion they involve.
Joint locks are commonly featured in all forms of grappling, whether it be in martial arts, self-defense, combat sport or hand to hand combat application. The variants involving lesser levering on a smaller joint (such as wristlocks) are often featured in law-enforcement or self-defense application, where they are used as pain compliance holds. Joint locks that involve full body leverage can on the other hand be used in hand to hand combat to partially or fully disable an opponent, by tearing major joints such as knees or elbows.
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Wikipedia