Thank you. I am an RN, worked for years in pre-op. I am a tennis player and golfer. This past weekend while visiting grandchildren in NJ , I had a slip in mud, did not fall, recovered myself. However 2 days later my knee swelled up to twice its size. This is day two of pain and big swelling. I think it is a bit better, my question is..... why, is the left lateral tendon making a snapping sound every time I move? It does not hurt when it snaps. Hope you can help, and thanks again.