Are you doing any exercises for your weak hips? I also had knee pain but it was off the bike. I used a foam roller every day for a couple of months with little improvement. My physical therapist gave my some exercises to strengthen my weak hip rotators, (she says that most cyclists have very stong hip flexors and weak rotators). I've been doing the exercises for about 3 weeks and they're helping more than the foam roller did. The PT is also a cyclist and she does the same rotator exercises as part of her normal fitness routine.
LORI
Pivot Mach 4 / WTB
Updated Vintage Terry Symmetry / Bontrager InForm RL WSD