Based on witnessing my relative after surgury of one knee, I suggest do one knee at a time. You can't be lame in both knees and still get around. Too much risk of poor healing.
It seems to be common to do both knees at once from what I’ve seen. Perhaps if you have one good and one bad, you favor the good leg and it hinders recovery of the other. Most prefer to get it over with in one shot.
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Dang! Another missed video opportunity.