I have had a successful knee replacement on the left (tore a meniscus in my first high school football practice - in those days they just removed it instead of fixing/repairing it). I now have stirrings of wanting to do the right knee as well - it hates airports and malls and anything else that is acres of walking on concrete-like surfaces. They went back into that knee when some surgical cement broke off and jammed in the joint; but while cleaning it out they replaced the teflon knuckle cups so I am good for another 30,000 miles. Or so.
I trigger the security equipment at airports whenever I fly now, and I have yet to be allowed through security without the total wand-and-glove check and pat-down.
I think it is probably easier, from a healing/recovery/rehab point of view, to do one knee at a time. Also if they screw up, they only screw up one joint at a time and you can consider other options or other surgeons if that happens.
My rehab was done in a big room where others were also moving through the different exercise stations. There seems to me to be a benefit in the collegiality that this inspires. I was very gung-ho myself and pursued recovery with vigor. I bungeed my cane to my Honda Hawk and parked across the street in a mall parking lot while doing my hospital rehab 3 times a week. When I came out one day the bike was gone - it had been towed because the towing company had apparently snitches that watched for people crossing from the mall parking to the hospital.
Walking is good exercise I know but it is way over-rated for people without knee or hip cartilage. Once you get the replacements then reconsider getting back to walking - without pain.
My two cents.
Let me ride 'til I croak.
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