Visiting Paris with a knee scooter.

You might get some intrigued looks (I've never seen such a thing in Britain). Pavements in Paris should be OK apart from the very occasional cobbled sections. I don't think you'd have any problems taking one of those on a bus. Metro might be a bit more difficult as there are often staircases with no escalator/elevator alternative. Similarly museums vary in accessibility as some are old buildings with narrow stairs and no elevator.

What a painful problem to have!!! I haven't seen many of these scooters in Paris either. I wonder how they would work on Paris' many narrow sidewalks, on the often uneven pavement and, of course, in crowds. With plenty of benches on the wider sidewalks, pocket parks with sitting space and cafes everywhere, Paris is a walker friendly city providing many places for a walker to sit a spell. The buses are also easy to use for those who find the steps of the metro a problem. Depending on what you'd like to see in Paris and on where you'd like to stay you might be able to eliminate by careful planning any distance walking and thus the need for a scooter..

You are going to want to use buses and avoid the metro where long walks and stairs are ubiquitous and using such a device in crowded corridors is probably not going to work well. You can claim a disabled seat on the bus if you can convince the people sitting in them that someone with what looks like a scooter is disabled. (I always advise people who need seats to carry a cane but obviously you can't do both)

I would also suggest doing some touring on open top buses either HOHOs or the Foxity 2 hours bus tour. I usually hate these things, but for your situation being able to drive by monuments while seated is a big plus. Similarly, the canal boat tour takes you through less traveled sections of Paris while seated.

There are a few major intersections that have no crosswalks, but only subterranean ("subway", sometimes) passages with stairs. I'm sure they can be avoided by taking a LONGER route, roundabout. Are you confident you can do bus steps, which tend to be high? And bus steps down might actually be dangerous if you have a scooter in one hand.

If you can't find a "checkbox" on the airline website for "other disability", I think it's fair to say you need wheelchair treatment. But it would be big plus to warn them that the scooter needs to be stored while you fly. Obviously there is no room to use it in the aisle. I think you are saying that you CAN walk to the toilet and enter and exit the plane. Do you have any unwise plans regarding overhead bin space, which may be unavailable or not near your own seat? Can you do that motion, even if the aisle seat is already occupied?

It is fair to say that Paris, like many other old, big cites, is best seen on foot. Your failure to mention "taxi" in you OP suggests that budget is a concern. You need to set aside funds to cater to your injury, in order to enjoy your trip as much as possible. (I mean that in a neutral way, not as a criticism.)

The RATP buses I was referring have entrances at curb level. The previous poster does bring up a question. If you carry this collapsed on the bus, you will have to stand with it in the bus section designated for strollers etc. You won't be able to have it by your seat because of the aisle situation. There are bus sections that put wheelchairs in a lock down position but I don't know how a flimsier vehicle would be managed.

Again, my uncertainty is dictated by the fact that I haven't seen many of these contraptions in Paris. There must be a reason.

Buses in Paris kneel and are designed for wheel chairs. I assume that a collapsible scooter could be held at the seat like a brief case would be, but don't know for sure. The other option is to take cabs or ubers. At the Louvre you can get wheel chairs for the day, but you need someone to push them unless you are adept wheeling your own. they would check your scooter as they do walkers. there is an office not far from the check room that manages this sort of thing.

I would be thinking about ways to manage a trip with minimal walking rather than focusing on what may be a difficult device to use in all situations in the city. Even if you do use the knee thingy -- a focus on organizing to walk as little as possible would be wise.

I'm basing my answer on the fact that I've had to use a knee scooter in the past when I broke my foot, and we've just been in Paris. THe things I would worry about are: the narrow sidewalks and traffic, the instability in crowds (in a crowded place if someone knocks into you, you can lose your balance), lots uneven pavement and then the weight of hoisting that thing around as you travel. Could you use one of those canes that folds into a seat when you need a break , or does that not really address the issue?
If not, then I would consider planning your itinerary around buses, taxis, Hop-On, Hop-Off buses ( there is a company that combines the HOHO buses and HOHO boats on the Seine.

The problem with the hoho boats is that often there are a lot of stairs involved.

After looking at several pictures of the scooters in collapsible position, I can't imagine how they'd fit on a RATP bus except if you were to stand with the scooter in the center of the bus in the space dedicated to strollers, shopping carts etc.

Contrary to popular belief, buses do not always meet the curb or kneel to accommodate passengers.
Little old ladies with grocery carts, old men with canes - the drivers don't care - they let them off wherever it's convenient.
Trust me when I tell you.

There are buses which do have ramps in the middle of the bus, which are easily identified with a wheelchair by using the ratp.fr website.

Or you could just take Parisien taxis.
Or you could rent a wheelchair, which would be more cost-effective.

People carry luggage or grocery carts and put them next to their seats, so your knee-thing wouldn't take too much more room than that. Kids bring their scooters de troittoir and don't fold them up, some wear skates...

Curbs shouldn't be a problem, at each place where a sidewalk crosses a street, the sidewalk dips to allow wheeled devices to go smoothly from one to the other (I'm aware of this as someone who takes a caddy back and forth to the grocery store).

I think like Chexbres that you can haul your knee scooter on the bus like anyone else bringing their caddy or scooter. It is true, however, as she mentions, that some of the bus drivers will not make the bus "kneel" to pick up or drop off, but hopefully most of them will!

Kim - I don't know which bus routes you use, but there are buses that will not kneel or dip at the curb.
It seems to be a sadistic game with some drivers.
Otherwise, there are road works which make it difficult for people to climb aboard the bus. One bus I used had to ask passengers to board outside of the bus lane, in traffic.