I'm not quite sure if this is the right forum for this, but I couldn't seem to find any for injuries. I've started to experience pain in my left knee recently, and I'm going to see a doctor, but I was just wondering what could be causing this so it doesn't happen again. Previous to this I had gone in for a peace-of-mind visit for my right knee, but there was no pain in that just a slight sensation I would feel sometimes. My X-ray was fine and so he just gave me a knee brace. I don't know if the knee brace could somehow be correlated to this pain, but I rode without it today and still was experiencing the pain. It doesn't set in immediately, usually more around 8-15 miles ha have to be put in before I start to notice it developing. In terms of fit, I've never had my biked fit professionally but the saddle height is good.
70's Legnano Road Bike, Late 70's Mercier Road Bike, Ideal Target Mountain Bike and a unicycle
I used to have a bike that for some uknown reasons was giving me very sharp pain in both knees. I really liked that bike, but it kept punish me for no reason. So I changed it for a wonderful Italian roadie. I'm knee pain free since then. I'd say borrow an other bike and test it to see if you experience the same pain.
There really are too many possible "reasons" for your symptoms for anyone to provide much helpful info online. Best bet is a sports med doc with cycling specific knowledge which could be combined with a medical bike fit. What it comes down to is that if you want a realistic picture of what is going on then you need a specialist who knows your medical history, can examine you in person, and ideally can address the specifics of your bike fit. Xrays will not show much and MRI can help but is generally unnecessary unless there is a specific injury they are trying to confirm....