The procedure of cooled RFA is carried out by first identifying the upper sacral foramina by placing three 27-gauge 3.5-inch Quincke needles into the S1 ... navigated in the neural foramen ...

The lower division of the fourth lumbar nerve joins the fifth, and the lumbosacral trunk thus formed becomes part of the sacral plexus, which includes the first four sacral nerves. The branches ...