Cracking or popping of joints is the action of joint manipulation to produce a sharp cracking or popping sound. This commonly occurs during deliberate knuckle-cracking. It is possible to crack many joints, such as those in the back and neck vertebrae, hips, wrists, elbows, shoulders, toes, ankles, knees, jaws, and the Achilles tendon area.
The physical mechanism causing a cracking sound produced by bending, twisting, or compressing joints is uncertain. Suggested causes include:
1. Cavitation within the joint—small cavities of partial vacuum form in the fluid and then rapidly collapse, producing a sharp sound.
2. Rapid stretching of ligaments.
3. Intra-articular (within-joint) adhesions being broken.
source: Wikipedia
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