X-ray CT-based evaluation of the resulting movement at each bone in the foot during input inversion

S. Shimawaki, H. Iwasa, H. Mori

Резюме: Objective: Studies on the input inversion are abundant owing to their relevance to inversion ankle sprains. Studies regarding the representation of movement in the talotibial and subtalar joints within the foot invasively are available; however, studies exploring comprehensive movement measurement in other foot joints are scarce. This study aims to provide noninvasive data on the resulting movement at each joint in the foot during inversion. Materials and methods: Cross-sectional images distal to the leg center were obtained using an X-ray CT scanner from 14 men. Two positions were used: a neutral position and an inversion position with the ankle joint in 20° inversion. Helical axis parameters (rotation angle and rotation axis) of the resulting movements of the distal bones relative to the proximal bones were calculated during the transition from the neutral position to the inversion position. Results: The movement of the talus relative to the tibia differed notably from that of other foot bones. The helical axes of all bones (calcaneus, navicular, and second metatarsal) relative to the talus showed a similar trend, orienting medially–superiorly–anteriorly. The calcaneus exhibited significantly smaller rotation angles relative to the talus compared with the navicular and second metatarsal. The navicular and cuboid demonstrated similar movement patterns relative to the calcaneus. Conclusion: During input inversion, the talocalcaneal and talonavicular joints serve as the primary sites of movement, with bones from the navicular to the second metatarsal functioning as a unit.

Series on Biomechanics, Vol.39, No.1 (2025), 41-50
DOI: 10.7546/SB.01.06.2025

Ключови думи: biomechanics; Bone model; deviation angle; helical axis; in vivo; inclination angle

DOI: 10.7546/SB.01.06.2025

Дата на публикуване: 2025-03-25