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.
When you bend your knee, some of the bubbles burst, and ligaments may snap or pop. This is normal, and happens to everyone from time to time. Arthritis, on the other hand, damages cartilage and bone. As the damaged knee joint moves, it may crackle and crunch. Crepitus also may be a result of an injury.