I will assume that there was no myelogram (dye in the canal) when the CT scan was performed. If not, a new MRI would be warranted.
The radiologist did not comment on fusion status of L5-S1. While this is not uncommon, it is also sloppy. I have no idea what “packing phenomena” means but there is no comment on fusion.
You do have a pseudoarthrosis of at least L4-5. With the slip that is noted and an attempted posterior fusion only (without TLIF), these pseudoarthroses are more common. You will need a revision surgery. Do not have revision with “larger screws” only. You need a TLIF at that level. You also need someone to comment on the fusion status of L5-S1. If you don’t have fusion at L5-S1, you would need instrumentation at this level along with a posterior fusion (not hard if L4-5 has to be revised).
I cannot comment on the need to include L3-4 as there is too little information to determine what the status of that level is currently.
Dr. Corenman
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.