What Causes Joint Crepitus?

Crepitus is the word used to describe the popping, crunching, and cracking sounds that emanate from joints during movement. These sounds generally do not indicate a dysfunction in the joint. In fact, these sounds often occur from normal body processes during motion. However, in some cases, joint crepitus can be a sign of problems developing in the joints from certain disorders. A closer look at the causes of joint crepitus can help patients determine if they should be concerned about these strange sounds coming from their body as they move.

Air Bubbles In The Joint

The joints of the human body are protected by a substance called synovial fluid, which acts as a lubricant for all joint structures during movement. This fluid contains a number of gases, such as nitrogen, oxygen, and carbon dioxide, which can make a cracking sound when the gas bubbles are released. When individuals crack their knuckles, they cannot produce the sound continuously. Air bubbles in the joint must build up before an individual can release it again with the same movement. Stretching the joint capsule is the mechanism that causes the release of the gas bubbles.

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