MIRA2002 Study Guide - Final Guide: Anatomical Terms Of Motion, Navicular Bone, Metatarsal Bones

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Document Summary

In the dp axial projection, the tarso-metatarsal and navicular- cuneiform joint spaces will be open. Area covered: proximal calcaneus, talar neck, tarsals (navicular, cuneiforms and cuboid), metatarsals, phalanges and surrounding foot soft tissue are included. Effect of lateral rotation: navicular tuberosity is shown in profile, there is an increase in the superimposition of the metatarsal bases. Effect of medial rotation: there is an decrease in the superimposition of the metatarsal bases. Central ray is angled perpendicular to metatarsal shafts (approx 10 degrees) Area covered: the entire foot should be demonstrated to show all phalanges, metatarsals, calcaneum and proximal talus. Exposure: bony trabecular patterns and cortical outlines are sharply defined, soft tissues are visualised, correct use of a filter will give uniform density of phalanges and metatarsals. This angle will vary according to the arch of the foot: 45 for a normal arch, 30 for a low arch, 60 for a high arch.