what causes crackling sound in joints
What causes the noise when you crack a joint? Escaping gases, movement and rough surfaces. Your joints can make a variety of sounds: popping, cracking, grinding, and snapping. The joints that crack are the knuckles, knees, ankles, back, and neck. There are different reasons why these joints sound off. Escaping gases: Scientists explain that synovial fluid present in your joints acts as a lubricant.