I just thought about this yesterday. I've had a number of surgeries and am waiting to have a huge surgery.
Eagles is really painful yet the surgery to fix it is an outpatient fairly easy surgery. My other situations have not been as painful, but have required much bigger surgeries, hospital stays, and missed time from work. Interesting.
To me, the hardest part of Eagles is finding a doctor who believes this and will then fix it. Shaw calls it "doctor hell".