Hi there!
Well, without an evaluation it would be difficult to identify the cause of knee pain in your case. Possibilities that may need to be considered include chondromalacia patellae, tendonitis, bursitis, fractures, patellar dislocation, injuries to the internal knee ligaments/ menisci, infections/ inflammations, arthritis, cyst formation, bone growths/ tumours, neuro-muscular causes, referred pain from other regions etc. An MRI would rule out most structural injuries, while recent injuries/ inflammation is still a possibility to be considered. I would suggest consulting an orthopedician for an evaluation and appropriate management.
Hope this helps.
Take care!
Are there any docs on here? Most of the posts on this site haven't been replied to as I look around, what gives..