AOKI LOCK

The Aoki lock is the wristlock variation named after Japanese MMA and submission grappling specialist Shinya Aoki, who used the technique extensively in Pride Fighting Championships and DREAM in the late 2000s. The lock applies hyperextension force on the wrist by trapping the opponent's hand and rotating it past the joint's natural range of motion, but uses a specific configuration of grip that differs from the conventional wristlock taught in BJJ curricula.

The mechanics begin when the opponent has extended a hand for any reason — defense, posting, framing, or grip-fighting. The attacker captures the hand with a two-hand grip and rotates the wrist sharply toward the back of the opponent's forearm, applying hyperextension force on the wrist joint. The Aoki variation differs from conventional wristlocks in the specific angle of rotation and the use of body weight to provide additional torque beyond the arm strength alone.

Shinya Aoki used the Aoki lock to finish multiple MMA opponents in the late 2000s, and the technique entered the modern submission grappling repertoire as one of several wristlock variations that competitors like Mikey Musumeci and Robert Drysdale have used as primary finishes. The technique is legal in IBJJF at brown belt and above, and in many modern no-gi rulesets. Defensively the technique is escaped by relaxing the wrist (which removes the structural target), by rotating the elbow rather than the wrist, or by hand-fighting to break the two-hand grip before the rotation engages.