The good news is, after the surgery he should be more comfortable than he's been in some time ... the hip in question was arthritic, so getting a replacement hip will relieve him of that pain.
I'll take some time off tomorrow and go visit him; my mom says that right now he's so doped up that he wouldn't know I was there anyway.
He's a tough old guy, but one of the key words there is old -- he's 80 and showing it. I expect he'll be fine, and maybe even better than fine once he gets used to the new hip ... but this recurring hospital theme is worrisome. :(