Romanus lesions are a result of AS or other forms of spondyloarthritis. I'm not a medical professional, so I can't say how serious or urgent your case is. If these were my MRI results, I would be asking the rheumatologist about biologics.
Ginny - 58 year old female
Dx with USpA in March 2013; changed to AS in July 2015
Iritis and Scleritis, both currently in remission
unicompartmental knee replacements: right-June 2014, left-Aug 2018
MTX, Humira, Cyclobenzaprine, plus Celebrex as needed
Supplements: Folic Acid, Vitamin A, Vitamin D, Calcium, Fish Oil, Culturelle probiotic, Melatonin (as needed)