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, tendonitis, bursitis, fractures, patellar dislocation, injuries to the internal knee ligaments/ menisci, infections/ inflammations, arthritis, cyst formation, bone growths/ tumours, nerve injuries referred pain from the hip etc;. I would suggest consulting an orthopedician for an evaluation and appropriate management.