I have bilateral knee replacements. Partial on the right, and total on the Left. I'm a CRRN, Certified Rehabilitation Registered Nurse. Get both knees done at the same time is a TERRIBLE idea! You need one solid leg, whenever possible, so you can pivot on it, to aid from transferring from the bed, to a chair, or to the toilet. Who do you think is going to LIFT you to do these things? Unless you have a muscle-bound spouse, I STRONGLY advise AGAINST it! Good Luck to you!