KP on another blog Joe's Training Room" asked the chicken or egg question pertaining to hip - ankle/foot dysfunctions.
And the answer is yes. They both react to the ground force reactions on a daily basis. As the foot/ankle complex works in conjunction with the hip to absorb forces, they essentially function as one unit. The real question becomes can the hip take up the slack for what the foot/ankle is not doing and vice versa? If the foot/ankle complex is predisposed to internal rotation via pes planus, then the hip must be adequate enough to pull the knee out of extreme internal rotation.