Some good news: last weeks creaks and groans I think may have been (not growing pains, but) maybe some tissue repair/muscle stuff (that's a medical term). This week, the numbness seems to be less, my knee is comfortable, and I feel my walking is more normal - although still no stairs. I feel good, and thanks to daylight savings, have been able to get out and walk a bit after work - farther than I've gone previously. My gait is slowish, but better. So, that's progress!