In the summer my knees were so wrecked I could barely make it up and down the stairs. My GP first thought it was an inflammation and prescribed something for that, but when I went back after a couple of weeks he said the cartilage may have worn off and prescribed me Flexofytol. It may be placebo effect, but between taking it a bit easier, cycling more, and the flexofytol, my knees are the best they've been since I injured them in the first place.