Arterial access from lower extremity. The common femoral artery is the only access site used in the lower extremity. Catheters used for performing coronary angiography via the femoral artery were developed by Melvin Judkins, MD; thus, the method often is referred to as the Judkins technique. This widely used method requires separate preformed catheters for the right and left coronary arteries (see the images below).
Urethral sounds/play, sometimes called sounding, is basically inserting objects (often steel sounds and catheters) into the urethra for erotic purposes. Sounds painful and unpleasant to most, but some people get a kick out of this.
The sound you are hearing in your knees may be crepitus. This is the sound that two bones make then they grind together. It may be a sign that the cartilage in your knee is breaking down exposing some of the bone which allows the two sides of the knee joint to rub together. Crepitus can be an early sign of developing osteoarthritis.