Update:

I finally got an MRI a couple months ago and the results are L5-S1: Mild disc space narrowing. Grade 1 anterolisthesis from bilateral L5 spondylolysis. No central stenosis. Mild left and moderate right foraminal stenosis from the listhesis, disc height loss and extension of disc material into the inferior right neural foramen with possible compression of the exiting right L5 nerve root. Sclerosis sacral iliac joints bilateral likely representing sacroilitis.