Went on a 4 day hike last week in the smokies. I didnt fall or twist my knee or anything but my right knee started aching on day 2 and by day 4 going downhill it really hurt. No swelling,some stiffness. Have been reading on the internet and dont know if I have patella tendinitis or a torn cartilage. Anyone have a similar problem and if so what did you do to get better? Never had a problem with my right knee when backpacking. Did have surgery on it 20 yrs ago from running and overuse.