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 believe that you may have hyperextended your knee, pay close attention for the following symptoms. 1  You may hear the knee pop or feel a popping in the joint when the hyperextension occurs. 2  The knee swells within just a few hours, post injury.  The back portion or side portions of the knee are in pain.