Контекст такой:

The subjects were barefoot in a сourt shoe to minimize slipping of the foot inside the shoe. The shoe
was secured to a movable foot plate by straps around the heel, the dorsum of the foot, and the
metatarsal heads. The foot was placed on the plate so that the inversion/eversion axis of the foot plate
was in line with the line formed by the center of the calcaneus and the second metatarsal head.

Заранее большое спасибо!