What is the pop or crack I hear when getting adjusted by a chiropractor?

What is the pop or crack I hear when getting adjusted by a chiropractor?

Chiropractor Vero Beach- When a chiropractor manipulates a joint, you should hear an audible pop or crack.  What makes that noise?  Let’s start with… No, it’s not the bones smashing together.  It’s cavitation of the joint.  The joint is filled with fluid called synovial fluid.  This fluid moves so rapidly from one side of the joint to the other that nitrogen bubbles come out of the solution and releases.  This causes the sound.  Many boaters will understand what cavitation is, because it often happens if you try to accelerate a boat too quickly and the prop begins to spin freely as the bubbles come out of the solution of water.  So, when you hear the crack, it’s just bubbles causing the noise to happen.  Dr. Thomas Harmody is a chiropractor at Vero Walk-In Chiropractic and Wellness in Vero Beach, Fl.