Injury equal Arthritis?

Hello everyone, i'll make this short and sweet. I am 27 years old and have practiced martial arts most of my life. When I was about 23 I dropped on my right knee while wrestling. I felt something hurt and went home for the day, elevated it and put ice on it. For the next 3-4 days my knee hurt and I could barely bend my leg, but soon after I felt "recovered" After a few weeks I was back to training.

I have since then stopped training but I still get a lingering pain in my knee through the day, nothing too bad, but it stays in my head as I sometimes think about starting to train again. The doctor took some x-ray's and he says its beginning stages of Arthritis and nothing else. Arthritis at my age? and resulting from an injury? Can anyone chime in? Is there anything I can do to "fix" it? Tweet