Popping or grating: Crepitus is the sound or sensation of grating, crackling or popping in the knee, ankle, spine, or other joint. Some people have joints that naturally crack or pop. For them, this is normal. Other people don't experience this until they have an injury or other problem causing joint inflammation. It can be caused by an irregularity of the joint surface or excess fluid in the joint.
Answered 10/18/2016
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