This has been a great discussion.
But it also highlights something - it begs that we need a national pain registry.
We perseverate on technics - but the real truth is - we don't know what works better. Anecdote is great for while, but it would be wonderful to actually know if and what makes the biggest difference. Dreyfuss may have the best outcomes, but it may have nothing to do with needle placement.
I have met and worked with many pain physicians, all with different techniques - all say their outcomes are the best. Some come right down perpendicular to it - swear it works awesome...but without tracking...without data...it's all just a fun story to talk about between us.