Internal Foot Rotation can be the Result of:
(1)  Antertorsion (Internal Femoral Torsion) - Click here for more information
(2)  Internal Tibial Torsion - Click here for more information
(3)  Metatarsus Adductus - Click here for more information
(4)  Primus Metatarsus Supinatus - click here for more information

Figure (left) Courtesy of the Hughston Sports Medicine Foundation