Oh really....well perhaps it was something elese I did,but my teachers always told me to get off my heel.
Perhaps it was me doing it on the balls of my feet then! lol
In tae Kwon Do there is many people with bad knees,some have no cartlidge left ither.EEEEPPP
Too add,my left knee is still not in its right place,my knee cap is towards the left of my leg and I cannot straigten out my leg 100 %,as well I do have problems with my ligements in that knee as well.