Asian girl students show white thigh

A compression lock (also known as a muscle lock, muscle slicer or muscle crusher) is a grappling hold which causes severe pain by pressing a muscle into a bone. A compression lock can cause a joint lock in a nearby joint when it is applied by squeezing a limb over a fulcrum. A forceful compression lock may damage muscles and tendons, and if accompanied by a joint lock, may also result in torn ligaments, dislocation or bone fractures. Compression locks can be used as pain compliance holds, and are sometimes featured in combat sports as submission holds.

A leg slicer (depending on the affected muscle also called for instance calf slicer or thigh crusher) is a compression lock that involves pressing the calf and/or thigh muscle into one of the bones in the leg. Similarly to the biceps slicer, a leg slicer can be applied by inserting an arm or leg in the on the backside of the knee, and flexing the opponent's leg to apply pressure to the muscles surrounding the fulcrum. Generally, the direction of the shin in the leg acting as a fulcrum will determine where the larger part of the pressure will go. Such leg slicers can be used as effective leglocks to the knee through a separating and elongating motion. Similarly to the biceps slicer, the calf slicer listed as a banned technique in the lower levels of some major Brazilian jiu-jitsu competitions