@mrmacabre thats what they told my mom forevver. they eventually just gave in and replaced her knees because she couldn't lose the weight becasue she cant exercise becasue all movement is so hard

@mrmacabre they want to replace my total knee because of worn meniscus and a couple of torn ligaments. Arthritus behind my knee cap too. My pain management specialist said knee ablation is where they determine which nerves are causing the pain and then go in and deaden them with heat. The nerves grow back in 6 to 24 months. I’m 78 and at my age I figured that might be a better option than a knee replacement! Success rate is really good and pain is minimal.

@mrmacabre I've had three or four girlfriends who had knee replacements and other important surgeries. The weight loss required before their surgeries was extremely difficult for them. As you say, it's kind of hard to lose weight when you can't even walk.
One thing you might have already thought about is chair exercises. If you can't find a good source on the Internet or through your medical provider, it basically is just sitting in a solid chair and moving your upper body. Diet, of course, is important for health and losing weight. I actually found something interesting on the internet the other day. When I was checking symptoms for a particular medicine, I came across the Cleveland Clinic's website and an article called "Life after Bariatric Surgery." I guess it's an in-depth diet for their bariatric patients to stay healthy.
The portions are probably extremely small but could be adjusted. And of course everyone should check with their doctors to make sure it would not be harmful for them.