The "crack" sound made by squatting and getting up is also called joint ringing. This phenomenon is very common. For example, when someone makes a fist, the knuckles will make a "pop" noise, stretch one's waist, turn the neck, etc.
If you squat down, there is only a "click" sound, the knee is not swollen or painful, and it does not affect your activities. It is likely to be a physiological sound, so don't worry too much.
The knee joint is composed of two meniscus , patella, cartilage, joint capsule, ligament, synovial sac, nerve and surrounding muscles. There are two main possibilities for knee joint snapping:
First, the knee joint movement is large, causing the knee joint to make noise due to friction and collision.
Second, when the knee joint is in a static state for a certain period of time, some gas will dissolve into the synovial fluid in the joint capsule and produce tiny bubbles. When we suddenly move the knee joint, the pressure in the joint capsule will change, and the bubbles will burst or vibrate together with the joint synovial fluid, which will make a crisp sound.
Generally speaking, there is nothing wrong with hearing joints snapping . However, if you find that your knee is not only "crack", but also accompanied by redness, swelling, pain and other symptoms, it is recommended to seek medical attention immediately.
This kind of buzzing may be caused by meniscus, cartilage damage or osteoarthritis, etc. It is necessary to find out the cause in time and treat symptomatically.
Source: Health Daily Push
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