I read a fascinating book, "Seeking the Cure: A History of Medicine in America," by Ira Rutkow, that answered some questions I'd always had about appendectomies.
If someone asked you to fill in the blank quickly in the sentence "The surgeon performed an _________" you would probably say "appendectomy." Yet it isn't such a terribly common operation today. Why is it the ur-operation, the one always used for purposes of hypothetical illustration? Why appendectomies?
According to Rutkow, It was a confluence of events. I hadn't realized that abdominal surgery had once been a medical taboo, with a nearly 100% mortality rate. Antisepsis ("Listerism") and anesthesia made it safe. It had once been extremely difficult to diagnose. I hadn't really thought of centrifuges, microscopes and blood counts as being a breakthrough in modern technology, but of course they were, part of the medical technology revolution that emerged from World War I. And they made it possible to diagnose appendicitis reliably. And there was one influential surgeon who promoted the idea that it was a surgeon's disease, that appendicitis "belonged to" the surgeon. Hospitals and surgeons found appendectomies to be lucrative, and they became almost a fad; Rutkow cites a hospital in which 1/5th of all operations performed were appendectomies.