Ralationship between elevation of the medial arch of the foot with the Windlass action and Inversion of the posterior foot

This study analysed whether in version of the posterior foot was related to the medial arch in the Windlass action. Subjects comprised 10 normal adult males. Roentgenogram were taken in a siting position, adding passive dorsiflexion. Calcaneo-first metatarsal angle (Hibbs angle) was measured on the lateral view of the foot, Tibio-calcaneal angle (TB-C angle) and Ankle mortice-heel contact angle (A-H angle) were measured on the posterior roentgenogram of the foot according to Cobeys method. We then compared the Hibbs angle, TB-C angle and A-H angle with the control group. When the toes were dorsiflexed Hibbs angle was significantly lower than in the Control group when all the toes except the fifth toe were dorsiflexed and the medial arch off the foot was elevated. However no significat differences were seen between the Control group and the TB-C angle and A-H angle in the Windlass action. We concluded that there was no inversion of the posterior foot in the Windlass action.