It would be pointless to separate the 2 surgeries by only one week. You will not recover any mobility in such a short period of time in your first leg and it will be in almost the same state as your second.
There are 3 reasons for doing it sequentiallly:
1. too avoid fat embolism
2. too have more mobility
3. to have a less intense pain
1. LLSouthAmerica, as a medical student, wouldn't you say that risk is lower, even if separated by 3 weeks?
2. even with Fitbone you can already stand up after 2 weeks and no bone formation (just not walk) and you are faster in wheelchait than on crutches. So only reason is if you have to drive a car during lengthening period or the place where you have to go has no wheelchair accessibility.
3. no true
So if 2 is not important, go bilateral, or seperate by 3 weeks to lower risk of fat embolism.