Originally Posted by
hairnet
I too have this sometimes and I have read that an imbalance in the strength of the vastus medialis and lateralis muscles of the quads can be a cause.
The VMO really is kind of just a theoretical entity. Regardless, training the vastus medialis seems to help. Physios usually only care that something works, not so much why or how.
Peterson step-ups. short-arc knee extensions. If your physio says, of course.