Compression lock

A compression lock, muscle lock, muscle slicer or muscle crusher, is a grappling hold that 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.

Achilles lock

An Achilles lock (also called an Achilles hold or Achilles squeeze or Ashi-Hishigi in judo) is a compression lock that involves pressing the Achilles tendon into the back of the ankle or lower leg. It is typically performed by wedging a forearm, especially a bony part of it, into the Achilles tendon, while leveraging the foot and the leg over the forearm serving as a fulcrum. This causes severe pressure on the Achilles tendon, and often also results in an ankle lock, since the ankle is being used as a point of leverage. Similarly, some ankle locks also cause a compression lock on the Achilles tendon, and hence the term "Achilles lock" is often also used to describe such ankle locks.

Biceps slicer

A biceps slicer (also called a biceps lock or biceps crusher) is a compression lock that involves pushing the biceps into the humerus. An effective biceps slicer can be applied by putting an arm or leg as a fulcrum on the opponent's arm at the inside of the arm by the elbow, and flexing the opponent's arm over the fulcrum.