You probably toe-out too a bit. I have posted over and over about this and toeing out when running from knock knees.
Dave Scott runs or used to run like this, and there are quite some fast runners, but its not desired, (ask any of them), and I’m not sure you can really totally change knock knees entirely, its anatomical a bit. You can strengthen your gluteus medius, and that hip flexor wad but I don’t think it completely fixes anatomically set hip angles.
You are going to be told to do a lot of one legged squatting, crab walks, exercises which strengthen your external and internal hip rotators.
There’s a good explanation of this. Go to mobility wod. Google Mobiliy Wod and Kelly Starrett addresses this issue constantly, on knee valgus. If I have some time, I will send you some links to the videos where he addresses this, but yes, it could be from hip.
Do you toe out when you run?
There’s a really really interesting approach to this and that is using kinesio tape and taping the glute med to make the runner more aware of USING THE GLUTE while runniing instead of allowing the TFL swing the leg around. The tape functions to remind the runner to use that muscle while running. Apparently, its gotten good results and does reduce some knee collapse Google Kiniesio Tape and Knock Knees or Kinesio Taping and and ITBS. They use step down tests to watch knee collapse, there’s pictures of it. Its interesting.
There’s also a lady who runs a lab on the east coast, somewhere at a University who addresses thiis by giving runner feedback to use glutes while running on a treadmill. Quite popular. She’s done some studies and has successfully gotten people out of ITBS issues. Forget her name.
Here’s a link to video about this with a runner, there are two videos, there’s another below it:
http://www.mobilitywod.com/2012/01/episode-361365-pathomechanics-and-it-band-hell.html