I'd like to find out if anyone has tried measuring with a recumbent bike, and if so how that works out. I am scheduled to get a hip replacement in December and I understand for some period of time you are not supposed to bend your leg past a 90 degree angle. (I signed up before I knew that!)
My bike with drop handlebars is out; a "sit up straight" bike might pass muster (I welome opinions on that); I was thinking recumbent might be the best way to prevent over-bending.
My initial thought is that a lower eye level could diminish your ability to pick out the best line to ride, but I don't know by how much.