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.
1 You heard or felt a loud pop during an injury. 2  Your knee feels swollen like a balloon. 3  You hear crunching and have pain when you try to move your knee or to walk.  Your knee gives out, buckles or locks, or something catches in the joint when you try to walk after an injury.