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 action of the popliteus when it contracts is twofold. 1) It rotates your lower leg at the knee like when you do a twisting turn to change direction in sports. Any action that can tear the cruciate ligament can also injure the popliteus. 2) The second action is to unlock your knee.