Pain can be felt on the outside of knee. The curious part about the injury is that pain is minimal to none during my runs, but would flare up post run. Going up and down steps and slight bending are particularly painful.
Probably caused by over-training. Consistently running on one side of the road is another. Tight hamstring and weak hip flexor may also have contributed to the injury.
Treatment included REST, X-Train (Swim), and also physical therapy - strengthening exercises, stretches, massages, ultra-sound, ice, and electrical stimulations.