​How to ID calcaneus

• ​biggest tarsal bone

• ​prominent epicondyle

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​See all bony structures here: https://radiopaedia.org/cases/anatomy-calcaneus

​Foot Arches

• Two longitudinal arches

  • Lateral

  • Medial​

• Two transverse arches (not pictured):

  • ​proximal (metatarsal bases)

  • ​distal (metatarsal heads)

​How to ID navicular

• ​round indentation, like navel

• ​medial, towards belly button

​Ankle Movement

• eversion/​inversion, oblique

  • ​subtalar (talocalcaneal)

  • ​talus, calcaneus

  eversion/inversion, AP

  • ​transverse tarsal

  • ​talus, calcaneus, cuboid, navicular

​How to ID Talus

• ​ID talus

  • rainbow-like curve on top (tibial articulation)

  • ​2nd largest tarsal bone

Foot Arches

• • Lateral Longitudinal Arch

    • Keystone: cuboid

  • ​Medial Longitudinal Arch

    • ​Keystone: talus

​Ankle Stabilization

• ​Three ligaments stabilize inversion of the ankle

  • - anterior talofibular

  • - posterior talofibular

  • - calcaneofibular

• ​Four ligaments stabilize eversion of the ankle

  • ​collectively called deltoid (medial) ligament

​Features of Talus

• ​See more angles here: https://radiopaedia.org/articles/talus

​ID Other Tarsal Bones

• ​Medial cuneiform

  • ​Flat, rhombus shaped

  • ​rough (i.e. nonarticular) edge on one face

• ​Middle cuneiform

  • ​smallest tarsal

  • ​square-shaped

• ​Lateral cuneiform

  • ​slightly bigger than middle cuneiform

  • ​rectangular

  Cuboidal

  • ​random big blob of bone

  • ​roughly triangular

​Citations

1. ​​Skalski M. Anatomy - Calcaneus | Radiology Case | Radiopaedia.org. Radiopaedia. Accessed October 7, 2021. https://radiopaedia.org/cases/anatomy-calcaneus

2. DBCLS B is made by. English:  Navicular Bone (Shown in Green).; 2013. Accessed October 7, 2021. https://commons.wikimedia.org/wiki/File:Navicular_bone03.png

3. DBCLS B is made by. English:  Tarsal Bones.; 2013. Accessed October 7, 2021. https://commons.wikimedia.org/wiki/File:Tarsal_bones_of_left_foot_-_animation02.gif

4. Wikimedia Snapshot. Accessed October 7, 2021. https://commons.wikimedia.org/wiki/File:Tarsal_bones_of_left_foot_-_animation02.gif

5. que-uga-mascot-web-credit-visitathensga-dot-com-mark-smith_B8957B88-5056-A36A-0ADB98CFC4636881_b89bae0a-5056-a36a-0a2101a6b3106c28.jpg (1446×1282). Accessed October 7, 2021. https://assets.simpleviewinc.com/simpleview/image/upload/crm/athens/que-uga-mascot-web-credit-visitathensga-dot-com-mark-smith_B8957B88-5056-A36A-0ADB98CFC4636881_b89bae0a-5056-a36a-0a2101a6b3106c28.jpg

6. Morgan MA. Talus | Radiology Reference Article | Radiopaedia.org. Radiopaedia. Accessed October 7, 2021. https://radiopaedia.org/articles/talus

7. Talus bone. In: Wikipedia. ; 2021. Accessed October 7, 2021. https://en.wikipedia.org/w/index.php?title=Talus_bone&oldid=1009407526

8. ​Hesse, DW. Anatomy Imaging Practice. October 7, 2021.