The method of delivering chest compressions remains the same, as does the rate (at least 100 per minute). It is hoped that the use of compression-only delivery will increase the chances of the lay public delivering CPR.
Much like when crack your knuckles, loud popping noises from your knees are most likely caused by what is called cavitation. Cavitation results from a change in joint pressure that allows carbon dioxide, which is normally dissolved in your joint fluidâa.k.a.
If you have cracking or popping that does cause pain or swelling, though, see a doctor. It can be a sign of: 1  Meniscus tears. 2  The meniscus is a rubbery C-shaped disc that cushions your knee and acts as a shock-absorber.