A little off the original topic, but to continue the discussion, just curious, when you are referring to hanging drop above, are you all meaning, some liquid in the hub of needle (whether contrast or not), and advancing without the use of an LOR syringe?
I think has been somewhat discussed in another post in the past, I don't use the above, but I do use a 22G with a modified hanging drop, where one uses the above technique, but combined with LOR. There is only enough contrast to fill the hub, but no additional fluid in the LOR syringe, so it is just air. My thinking is that the added pressure from the LOR syringe will make it more clear when you enter the epidural space, rather than just relying on negative pressure to suck in the fluid. I release the pressure on the LOR syringe as soon as I see the liquid start to drop. Using CLO. Checking fluoro before/during/after ligamentum.
Ok, time to put on my thick skin armor on.