![]() MRI of a cracking finger joint depicting cavitation between the bonesįor many decades, the physical mechanism that causes the cracking sound as a result of bending, twisting, or compressing joints was uncertain. ![]() It is possible for voluntary joint cracking by an individual to be considered as part of the obsessive–compulsive disorders spectrum. To be able to crack the same knuckle again requires waiting about 15 minutes before the bubbles dissolve back into the synovial fluid and will be able to form again. The pressure inside the joint cavity drops and the dissolved gas suddenly comes out of solution and takes gaseous form which makes a distinct popping noise. This happens when the joint cavity is stretched beyond its normal size. The cracking mechanism and the resulting sound is caused by dissolved gas (nitrogen gas) cavitation bubbles suddenly collapsing inside the joints. However, this is not supported by medical research. The cracking of joints, especially knuckles, was long believed to lead to arthritis and other joint problems. It is sometimes performed by physical therapists, chiropractors, osteopaths, and masseurs in Turkish baths pursuing a variety of outcomes. Cracking joints is manipulating joints to produce a sound and related "popping" sensation.
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