hi i think part exercise related and part warmth i have found the neoprene supports are really good for warmth and if need be try doubling up or them. but you really need to go back to basics from when you had this done for exercises get back into them daily but if this is not working ice it to get the swelling down 3 times a day for you its just get a shovel of snow in a carrier bag keep that on your knee for 20 minutes. hope this helps you. good luck
i had acl surgery 20 years ago intense rehab. now in winter my knee swells and stiffens. what is going on in my knee? . i live in canada but have been escaping the winter in the past 7 years until this year. after shoveling snow through the winter my knee kept getting stiffer and swelling occurred. difficulty bending the knee getting up or sitting down. it seems cold related but i may be wrong. in the past 2 decades my knee did swell and stiffened after major exertions for a short time but very brief and not as intense as this time. i am presently 47 years of age. sincerely . stephen