BASIC SHOULDER LOCK MECHANICS
Shoulder locks function by creating rotational pressure through the shoulder joint, typically by isolating the arm and applying torque in a direction the joint is not built to tolerate. Unlike elbow locks, which hyperextend the arm in a straight line, shoulder locks rely on internal or external rotation, forcing the ball of the shoulder to twist inside its socket. When done correctly, this pressure threatens both the shoulder and the elbow due to the interconnected leverage along the arm. The submission becomes effective when the opponent's wrist is controlled while the elbow and shoulder are pinned or manipulated in the opposite direction. Tight frames, strong posture, and full-body control are essential to prevent them from rolling out or regaining mobility.
KEY LOCK
The key lock, commonly referred to as the Americana, uses external rotation to apply pressure to the shoulder joint. The opponent’s elbow is bent at 90 degrees, with their wrist driven toward the mat while the elbow is gradually lifted. The classic figure-four grip is used to trap the wrist and reinforce the torque. This submission is most commonly applied from side control or mount, where you can pin the opponent’s shoulder to the mat and use your upper body to lift the elbow, stretching the rotator cuff. The goal is to eliminate movement in the shoulder and force the joint beyond its natural limit, with the mat acting as a secondary frame to assist in the finish.
MOUNT CONTROL
A commonly taught Americana from Mount, although not as efficient.
SIDE CONTROL
The more efficient Americana, taught from Side Control
SCARF CONTROL
A very powerful and effective Americana, done with your legs, from Scarf Control.
REVERSE KEY LOCK
The reverse key lock, most often called the Kimura, uses internal rotation to attack the shoulder joint in the opposite direction. With the opponent’s arm bent behind them, the figure-four grip controls the wrist and reinforces pressure by rotating the arm up and the knuckles behind the back. The Kimura is incredibly versatile—it can be attacked from guard, side control, north-south, or even during scrambles and transitions. Mechanically, it works by rotating the humerus (upper arm bone) inward, jamming the shoulder against its own structure. This creates immense pressure on the joint while also threatening the elbow, making it one of the most reliable and powerful submissions in Jiu-Jitsu.
KIMURA
The most efficient Reverse Key Lock, a Kimura from Side Control.
OMOPLATA
A Reverse Key Lock, done with your legs.
TARIKOPLATA
An Omoplata in response to them defending against your Kimura by hiding their hand.