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.
The sound you are hearing in your knees may be crepitus. This is the sound that two bones make then they grind together. It may be a sign that the cartilage in your knee is breaking down exposing some of the bone which allows the two sides of the knee joint to rub together. Crepitus can be an early sign of developing osteoarthritis.