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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Snapping Tendons Or Ligaments
Another cause of joint crepitus is the mechanical effect of tendons and ligaments as they are moved from one position to another. These structures that function to move the bones of the joints will shift out of their normal position when movement occurs. The tendons and ligaments stretch during the movement, and during the process, may slide over bone ends. Then, they will 'snap' back to their normal position, creating the cracking sound. This movement and noise may sound troubling, but tendons or ligaments snapping is perfectly natural and does not necessarily mean there is a problem with the structures. However, if pain or swelling occurs during movement, patients should consult a doctor to investigate the problem.
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