Small joint manipulation, in grappling, refers to twisting, pulling or bending fingers or toes to cause joint locks in the various joints in those appendages. Joint locks on fingers and toes are respectively referred to as finger locks and toe locks.
The leverage needed for such joint manipulation is comparatively small, since grabbing a finger or two with one or both hands creates a distinct advantage. Joint manipulation can allow a weaker person with the right training to control a stronger one. Grabbing just the wrist may lead to the opponent being able to pull it free, while grabbing a couple of fingers, instead or along with the wrist, can greatly reinforce a defender's ability to hold on to a wrist lock completely through execution and control.