A Problem with the can be frustrating, a problem generally can be frustrating. Wanting to do something you are able to but not having the strength or means to do it can be annoying, worse is seeing others doing what you wish to do. A knee problem could get worse if you force it, trying to work out something that cannot be worked will only prolong the problem and make it more complicated. I think the best way to live at this time is to be patient, it will take time but eventually you will be free; never compare yourself to anyone, you are not living for the same purpose.
A 5 minute prompt, follow this link to participate: https://steemit.com/hive-161155/@mariannewest/day-1460-5-minute-freewrite-wednesday-prompt-knee-problems