This is not a trick question but one meant to be read carefully. Tearing a ligament causes pain. But does a TORN ligament that's been in a pt for over a year (not counting for factors like more injury that could or could not result to swelling) actually _cause_ pain. I know we have pain receptors; but one would think that wouldn't be an issue of a year old TORN ligament. If so, how does it cause the pain once torn and knee is stable?