phughes

Take your time and don't overdo it. The seat you have may be okay for you, after you get a few miles under your belt. I would stay away from a memory foam saddle. Generally speaking, a softer saddle is worse than a firmer saddle. These are just generalities though, and every one is different.

The padded shorts under the scrubs sounds like a good idea for you. As for seat height, for now, lower is not a bad idea, just don't go too low. You have to work with your flexibility, and I am sure that after a hip replacement, you won't be as flexible as you were, for now. Try not to try to push too hard of a gear either. It is better to spin the pedals faster, than it is to try to push hard on the pedal, especially coming off a hip replacement.

Best of luck wit the recovery, and getting back into biking. Most importantly, have fun!