I think somebody answered this question in your other post. THe knee still has inflammation, and when used, may still get warm and swell, especially until you do enough physical therapy to turn it around and decrease the swelling. Swelling is a sign or inflammation.WHat meds are you on. Are you taking an NSAID? I think that many many peole concentrate on the place they have surgery too much, and feel, or concentrate on every lilttle symptom beyond its significance. IF you have red, hot swollen knee with streaking, or drainging , running a fever, etc. (check the instructions you got post op) then contact your OS about a possible infection. THey can culture what is draining or do a blood count, or culture if there is an infection. Depending on what meds you are already taking you could try some Nsaid,ibuprofen, for example, and see if that helps, it could help the pain too. I have had multiple scopes for every reason under the sun and was told to start weight bearing the next day as tolerated, and after a failed total knee I still walk relatively well, according to PT, because I was determined I would. As we know pain is subjective, but it does not have to control us. I truly understand pain, as I have dealt with it for many many years, and it still increases. As far as the fluid be drawn off, I know that where the needle is placed is often sore, I got mine done several times up to 30-50ml at a time or more. The steroid injections always make me sore for a few days afterwards.
I know that others have told you this, but why not do PT as instructed, and after a week see how it goes, rather than concentrating on each and every movement, resulting pain, and other symptoms. See if that can help. As far as a walker, they have their own horrors, like the crutches. I used crutches for over 6 months ofor a pinned ankle and decided the pain the crutches caused was worse than the ankle pain. Take meds 30 minutes before PT, and then do the PT and then when just sitting ice and elevate, but not all the time. I know it hurts to move, and what most of us do is make ourselves get started, and as the joint limbers up, it becomes more pliable and easy to move. Most OS are of the opinion that they operate, and you do the recovery. I wish you luck, but you will have to make your own outcome. It is much HARDER and MORE PAINFUL to get a joint to move after months of babying it and barely moving it. I don't do stairs well, and by the time I do 6 or so, I can barely stand to do more, but I make my self get that knee up there for the remaining 6. IT is your decision, but we are just trying to give you the benefit of our experiences. Sometimes , usually, in fact, PT DOES make it hurt more, but in the long run, well functioning muscles, not flaccid , are the key to recovery.Teresa