I have been diagnosed with Osteoartrithis. 20 year ago broke my ligaments and my knee has been kind of loose since then, it never bothered me so didnt do anything about it. Had some knee pain and Dr say I have Osteoartrithis, Im 43 , full into sports and in excellent shape, ride mt bikes, 4 times a week, swim,body surf, and ride dirt bikes for a living, guiding tours . Saturday I went riding dirt bike and after 2 hrs I went thru a rough section, fast standing up on the pegs and felt a super sharp pain in my knee, and after that I couldnt ride anymore. The Dr here said to stop Mt biking, but that I could continue with dirt bikes, and when mt biking it doesnt hurt, only when I need to pull up with my knees to go thru a technical section, but no pain when pedalling or going downhill. So is Dirt Bikes over for me? because of my condition? I can post a picture of my XRay here?