I have not heard this caution related to tummy tucks.
I do know that in general there are some issues with AS patients and anesthesia.
The anesthesiologist normally tilts a patient's head back to insert the breathing tube, and keeps the head tilted back to maintain the airway during surgery. If you have limited range of motion in your cervical spine, that can make the anesthesiologist's job more difficult.
Also, you can have problems if you have limited chest expansion due to rib fusion or other issues. If your breathing is too shallow, it can hamper your lungs' ability to recover from anesthesia, which can put you at risk for chest infections and other complications.
You should discuss the surgery with your rheumatologist and make sure that both the surgeon and anesthesiologist are aware of your condition.
Ginny - 57 year old female
Dx with USpA in March 2013; changed to AS in July 2015
Iritis and Scleritis
unicompartmental knee replacement June 2014
MTX, Humira, Cyclobenzaprine, plus Celebrex as needed
Supplements: Folic Acid, Vitamin A, Vitamin D, Calcium, Fish Oil, Melatonin, Culturelle probiotic