FIGURE 3.

Rotation center of the metatarsophalangeal joint shifted down:²⁶ the determination of the center of rotation of themetatarsophalangeal joint was achieved through the use of three points on the metatarsal head. Point A is the central point of the articular surface of the metatarsal head, in the same straight line as the longitudinal axis of the proximal phalanx. Point B corresponded to the lower (plantar) and more proximal edge of the head before its transition to the plantar surface of the neck. Point C is the dorsal highest point of the metatarsal head.