av had pain in me knees for years (havent got a clue how i done it) but me left 1 had a big lump on the side ov it, went to docs and he sent me to see a knee person and 3 weeks later am in hospital, they said my cartlage was leakin fluid so they put a stitch in it as they said it was to good to remove, i had keyhole its been 6 days now i wouldent say its sore but there is a niggley pain behind me knee cap, but not enough to keep takein me pain killers,