Ive had knee pain for a verry long time im 16 right now and ive had an mri and numerous xrays.....On my mri it showed a little bit of the cartilage under my kneecap I think rubbing off, when my knee starts hurting like now it hurts to do n e thing with it, whether im sitting or walking.........I've noticed its worse when the weather changes like when a cold front moves through.......Im only 16 though so I dunno whats going on........I've been to physical therapy multiple times and it still hurt, ive gone to 2 orthopedic surgeons and they both suggested physical therapy.......Which is getting very annoying......Earlier this year like in spring they found a cyst on my tibia a little below my knee but I dont think thats the problem because it doesnt hurt me.......N e 1have n e ideas why my knee hurts during pressure changes or what it could be?