It sounds to me as if your surgeon left your rectal cuff and if so then yes, you may still get UC-like symptoms in that tiny portion of remaining tissue. You can treat that area with UC meds, both oral and suppositories or enemas. My rectal cuff was stripped so I no longer have any UC issues. My understanding is that many surgeons choose not to strip the cuff as it's very easy to render the patient incontinent. Only very very experienced surgeons will strip.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free