There was a lot to talk about on this page and I couldn’t fit any more information in the book.

The A1 pulley is usually seen slightly proximal to the MCP joint but in practice, it’s whichever pulley you find closest to the MCP joint.

The A2 pulley more distal, close to the middle of the proximal phalanx, and it’s a bit wider.

Ideally, you should palpate the location of the nodule, where it catches, and/or where the pain is and plop the transducer right on top of that! If you get the medicine in the tendon sheath, it will treat most of the pulleys in the area.