They may be able to feel a crunching or cracking if they place their hand over the knee and bend or straighten it. The person may hear it when they extend their knee. Other people may or may not be able to hear the sound.
It usually happens when air bubbles develop in body tissues, but it can also happen when the tendons or ligaments snap over the bony structures in the knee, or as a result of patellofemoral pain syndrome (PFS), torn cartilage, or osteoarthritis (OA). It can affect different parts of the body, but it is common in the knee. The name of this cracking or popping sensation is crepitus. It is not unusual for people to hear a noise or feel a cracking, crunching, or popping sensation when they move their knee.
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