The Axonics INS should be located how far below the iliac crest?

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The depth of the implantable neurostimulator pocket is chosen to balance a comfortable, concealed position with a safe, stable placement. About 4 cm below the iliac crest places the device in a well-padded subcutaneous layer, providing a cushion against pressure and friction, while keeping it accessible for programming and easy to feel for future checks. This depth also reduces the risk of skin erosion and device palpability, which can happen if the pocket is too shallow. If the pocket is only a couple centimeters below the crest, it may be too shallow for comfortable concealment and could irritate the skin as it stretches. If it’s placed much deeper, like around 6 cm, it can be harder to access, may cause discomfort or pain, and increases the chance of a noticeable bulky feel under the skin. Placing the device right at the crest would put it over a bony prominence, which is not ideal for a comfortable, stable pocket. So, four centimeters below the crest is the best, practical depth.