I agree. Theoretically you get more anteriolateral spread with TESI. This is one of the main reasons most of my attendings preferred TESI over IESI. And you're right, depend on pathology, the volume of injectate, etc, you might be able to get the meds to spread to an adjacent DDD. It's, however, a stretch to say a single level TESI can give you the kind of shotgun coverage as in a paramedian IESI. On the other hand, if all the symptoms are unilateral, multi-dermatomal (or non-dermatomal), or multi-level DDD on imaging, you do want to have a more "shotgun" unilateral coverage to target radiculopathy. It's a very reasonable decision to make on an individual basis. Again how often do you do this, is based on your patient population therefore the complexity and multitude of spinal pathology.
Another example to share, I had a patient today with right-sided L2-3 annular tear, bilateral L4-5 severe DDD, moderate foraminal stenosis, and multi-level mild DDD in other levels. He has no radicular symptoms at this time, 95% symptoms are axial LBP with very intermittent numbness at right big toe. Bilateral MNBB didn't help, concerned of possible discogenic pain due to L2-3. Decided to do bilateral L4-5 TESI, and right-sided L2-3 TESI. I believe this is the best approach to treat his axial LBP with medication delivered to where the pathology is. If this doesn't work, we might need to consider fusion vs. SCS. In another words, this is his last try with minimally-invasive procedures. He is desperate to see something that would work. Therapeutic benefit is what he's looking for, not diagnostic specificity (besides his insurance only approved one procedure, not sure if they would allow us to go again with TESI at another level or two). He appreciated that I spent time and effort to think through the problem and come up with a solution as opposed to offer him a cook book option. In this case, there is actually no standard option I can think of, except defaulting to IESI, obviously with no way to guaranteed meds go to right L2-3 and bilateral L4-5.
IESI is easy and really no-brainer. It's one step ahead of caudal esi. When we had TESI techniques, pain management advanced one step further. You can really tailor your treatment options based on your patient's presentation, physical exam and imaging findings. Not only we need to be open-minded to different practice patterns, but also realize TESI is where individualized treatment plan can be made.
To the OP, it's very reasonable to post your question on the forum to get OPINIONS from more experienced fellow docs what they do. We all do the same. This is how we improve ourselves through a collective mind pool. It is unreasonable on the other hand, to jump to a conclusion that if someone does something differently than what we do, immediately we default to the thinking that others are incompetent or unethical.
Think rationally, talk humbly, and judge carefully!
To guys who have sent me supportive private messages, I appreciate your input. I don't feel being intimated at all. If someone has knowledge and experience to criticize my practice and I think it makes sense, I will gladly adopt it. It's not about my ego, or how I was trained, it's about giving my patient's the best they can get from a competent pain management physician.
If we do not hold high standard (pain relief, it is what I'm referring to) on what we provide to our patients, and with pressure coming from every corner, we ain't going to have a specialty in the near future.