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.
Most common reasons your knees pop or snap: 1  Chondromalacia â Is a condition where the cartilage under your kneecap is starting to degenerate. 2  As the cartilage degenerates the surface can become rough. 3  That rough surface will rub against the femur and cause snapping, clicking or popping.