Foot

Page Index: Tips | Anatomy |Accessory ossicles | 

Mikael Häggström, CC0, via Wikimedia Commons

Normal AP

11. Medial sesamoid

12. Lateral sesamoid

13. Shaft of second metatarsal

14. Neck of third metatarsal

15. Head of fourth metatarsal

16. Metatarsophalangeal joint

17. Proximal phalanx

18. Middle phalanx

19. Distal phalanx


Normal: Lateral

1. Tibia 2. Dome of talus 3. Neck of talus 4. Head of talus 5. Navicular 6. Superimposed cuneiforms 7. Cuboid 8. Base of fifth metatarsal 9. Styloid process of fifth metatarsal 10. Calcaneus 11. Anterior tubercle of calcaneus 12. Middle tubercle of calcaneus 13. Posterior tubercle of calcaneus


Normal:  Frontal

Yellow - medial cuneiform |Red - intermediate cuneiform |Light green - lateral cuneiform | Dark purple - navicular | Light blue - cuboid | Dark green - talus | Orange - calcaneus | Dark blue - tibia | Light purple - fibula


Normal: Oblique

Calcaneus


Lisfranc injury

  



Lisfranc injuries, also called Lisfranc fracture-dislocations, are the most common type of dislocation involving the foot and correspond to the dislocation of the articulation of the tarsus with the metatarsal bases.


Radiopaedia

Lisfranc injury - Detection

The key finding is malalignment of the second tarsometatarsal joint, such as lateral displacement of the second metatarsal base on AP view and/or dorsal step-off sign on lateral view. 

The step-off sign is the radiographic appearance of Lisfranc injury on lateral projections of the foot when there is a dorsal displacement of the second metatarsal base. At the tarsometatarsal joint level, this displacement interrupts an imaginary line drawn on the dorsal surface of the foot 1-6. The sign is accentuated with plantar flexion and axial loading 2.

An additional abnormality is diastasis >2 mm between the 1st and 2nd metatarsal bases.

Radiopaedia

Cavovarus

High Longitudinal arch

Varus angulation