The Meaning of Clicking Joints

Many people cringe at the sound of knuckles, elbows and other joints cracking. The debate surrounding whether this common cracking could cause joint problems has recently been settled. It has been confirmed that the popping sound is a result of an unwanted vacuum within the synovial fluid that lubricates the joints, locking the joints together.  When the joints are adjusted, the vacuum draws in a small air bubble and the noise is this air bubble being rapidly drawn in by the vacuum. The release of the vacuum by the air bubble allows the joint to move more freely.

This phenomenon is known as joint cavitation. Once the bubble is present, the joint will not crack again until all the air has been reabsorbed and a new vacuum is created.  This targeted approach reduces the likelihood of unintended cracking. In other words, cracking the joints in a controlled manner relieves stiffness and enhances the stability of neighbouring joints.

It is important to note that there are other cracking noises and sensations that may require attention. Snapping and cracking noises can be a symptom of osteoarthritis, which occurs naturally with ageing or as a result of trauma or joint diseases. In these cases, the breakdown of cartilage in the joint leads to painful friction and crunching noises during movement.

On the other hand, snapping noises and sensations are also caused by the movement of muscles or tendons across bones. This typically happens when a tendon is slightly loose and is most commonly experienced in the hip, knee, ankle, wrist, and shoulder. If left untreated, this condition can potentially lead to bursitis, which is the inflammation of the fluid-filled sac that allows muscles to move smoothly over bones.

Understanding the reasons behind joint cracking and the potential consequences of certain cracking noises can help individuals make informed decisions about their joint health.