While hospital enemas have become fairly uncommon these days, they are still part of a preparatory protocol for different types of procedures or surgeries. Because so many are done on an outpatient basis, preps are usually specified to be accomplished at home prior to admission. That may well include a Hibiclens shower and also an enema.
My orthopedic surgeon suggested a Fleet's enema prior to my TKR. He also suggests them prior to hip surgery and indicates in the printed handouts that it is to reduce the need to use the toilet for a BM shortly after surgery. His staff actually provided the Fleet enema and Hibiclens solution and brush.
Because I enjoy some dialogue, when I was asked if I had any questions by the nurse, I inquired if a water enema was acceptable. I furthered the issue by asking if soapsuds was suggested and what quantities were recommended. This dialogue can continue when asked, prior to surgery, if you followed the prep protocols, urinated, or had a BM.
Post surgery, and prior to discharge, the recovery room staff usually go over the pain management issues among other things. They almost always cover the potential for constipation due to the opioid pain meds. This has always been another opportunity to engage in dialogue regarding enema use or recommendations.
I've found that most older nurses are fairly well versed and will discuss such topics with a degree of experience. Many younger nurses don't seem to have a base of knowledge or experience to discuss such things. They often have to go ask someone else. It seems they are well versed in carrying out their specific tasks, but alternatives sometimes pose some difficulty.