I believe it is
in part due to patellar mistracking. I have been working on
flexibility in my hamstrings and quads, as well as strengthening my VMO, since it is weaker than the outer quad muscles. I have been doing wall sits to strengthen my VMO, since squats are too painful and leg extensions agrivate the condition. However, these excersizes seem to do little to help with the pain, even though I have been doing them for at least 6 months now.