Cracking and popping joints, medically known as crepitus, are normal. Joints are points in your body where two bones meet. You might occasionally hear your knees popping or notice your back or bones crack as you move them.
Source: health
Should You Worry About Joints Cracking or Popping?
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Valley Orthopedic Associates
627 East Foothill Blvd
San dimas, ca 91773