Joint lock in Aikido
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 budo these are referred to as, 関節技 kansetsu-waza, "joint locking technique"[1]) and in Chinese martial arts as Chin na su which literally means "technique of catching and locking".
These typically involve isolating a particular joint, and leveraging 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, even dislocation, or bone fractures.
Source : http://en.wikipedia.org/wiki/Joint_locks
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