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.

Design of Manipulator Controlling System for Loading and Unloading Container Wristlock
Wristlock, Wrist-Joint
'Wristlock restraint' and physeal injuries of the distal radius
Wristlock, Wrist-Joint
Wristlock, Wrist-Joint
Wrist lock
Kimura vs. Double Wrist Lock
An Unusual Case of Triangular Fibrocartilage Complex Tear after a Wrist-Lock Restraint
Edge of Freedom: Knife Defense Tactics for a Changing World
The Aston Case: Police - Crackers Helped Track Down 'Spaniel'