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What is that “popping” sound?

Many people want to know what the “popping” sound is that happens with a manual adjustment, i.e. being adjusted without the drop table or an instrument. The sound that is heard is called a “cavitation” and is the byproduct of fluid that acts as a lubricant in your joints, known as synovial joints. When the joint capsule stretches through the adjustment, it rapidly releases this build up of gas resulting in this sound. Why is this good to know? When you receive an adjustment and you hear this “cracking” or “popping” sounds, it does not mean the joints or bones are being injured. It is also helpful to know that many adjustment styles (using an instrument or drop table) often do not result in any audible sounds and just because you do not hear anything, does not mean that the adjustment has not taken place.