hi, I am 80 years old, have been in good health, low blood pressure. my left knee started swelling 3 days ago, bright red blotchy and hot to the touch. the next day there were bruises near it. I had been working at a habitat store, restore and on my feet on cement for about 3 hr. I walk often, do machines and have had no problems. however, in 1974, I fell hard on the cement and had a swollen knee called a football knee and had to elevate and it was a bruised ligament. could I have injured that same spot. thanks in advance. loris degroff, e mail: LorisD@webtv. net. Oh yes, I weigh 140 lb. and am 5 ft. 6in.