Foot Anomalies

Question 1

Congenital fibrous or bony union of the tarsal bones

Answer 1

Tarsal coalition

Question 2

The two most common tarsal coalitions are:

Answer 2

Calcaneonavicular (50%), and talocalcaneal (35%)

Question 3

What radiographic view is best for visualizing calcaneonavicular coalition?

Answer 3

Medial oblique ankle

Question 4

What is a tell-tale sign of talocalcaneal coalition on a lateral ankle radiograph?

Answer 4

“C-sign”

Question 5

The 1st metatarsal bone is short relative to the 2nd

Answer 5

Morton’s Toe/syndrome

Question 6

Failure of union of the secondary growth center at the posterior talus, resulting in a fragment of bone. May produce posterior ankle pain on plantar flexion

Answer 6

Os trigonum

Question 7

Secondary ossification center of the medial navicular. Has 3 types

Answer 7

Accessory Navicular (Os tibiale externum)

Question 8

Accessory ossicle between first and second metatarsal

Answer 8

Os intermetatarsaum

Question 9

An ossicle near the cuboid bone (posterior to it)

Answer 9

Os peroneum

Question 10

Ossicle on the superodorsal aspect of the navicular bone

Answer 10

Os supranavicular