^^^ I dunno what advice you got about your knee, but my mom's been doing the following and says it actually works:

"Place a box full of golden raisins (must be golden) in a glass vessel, like a canning jar. Pour in gin specifically made with Juniper berries, until the raisins are completely covered. Let the raisins sit for a week at room temperature and soak up the gin. After that, eat 10 raisins per day. Theoretically, if you have arthritis pain, this will help."