Orthopedics Questions? Ask an Orthopedist for Answers ASAP
This is Dr. David
there looks like indention of the left ventral thecal sac and impingement of the L5 nerve root is most likely what is causing your pain in your buttocks and sacral area.
you might need a steroid injection into the Left L4/5 disk space to see if the steroid injection helps decrease inflammation so the disk go back into place.
it sounds like you have gotten an injection already which didn't really help.
it sounds like that disk at L45 being out of position is what is causing your pain.
physical therapy could help.
a TENs unit on your back could help distract your back and decrease pain.
if the pain continues, you might have to see a neurosurgeon to talk about options for spine surgery.
hopefully that won't be the case
let me know if you have questions.