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Fig. 6 | Journal of Orthopaedic Surgery and Research

Fig. 6

From: Establishing a common instantaneous center of rotation for the metatarso-phalangeal and metatarso-sesamoid joints: a theoretical geometric model based on specific morphometrics

Fig. 6

a is a shadow drawing of C-T section 31 representing the sagittal section defining the approximate trough of the tibial groove. Note its elliptical (flattened) surface, which almost immediately starts to curve somewhat perpendicular to the metatarsal longitudinal axis. b is a shadow drawing representing C-T section 15 defining the approximate trough of the fibular groove. The fibular groove begins more proximal, with its proximal flattened surface more parallel to the longitudinal axis of the metatarsal. Tibial sesamoid contact point at the proximal aspect of its groove is designated T; the initial fibular sesamoid contact point in its groove is designated F. Placing a Ftan at the base of the metatarsal illustrates how the different elliptical characteristics of each groove will affect its CR and motion distal and proximal to its x-axis

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