Pullin My Knee Forward and In

I pull my knee forward and in when I pitch and i think it is messing with my accuracy. What should I try to do to stop doing this with my knee? And are there any drill that might help me stop this?

Step 1: Go to the video clips library of this board and study what those guys are doing.

Steps 2 & 3: Post video for us to see and comment on and ask more questions then.