BASIC PODOPEDIATRIC RADIOLOGY II

Question 1

name this accessory bone:

AKA accessory navicular, pre hallux, navicular secondum

Answer 1

accessory navicular

Question 2

how many types of Os tibiale externum?

which one is never symptomatic and found inside the PT tendon

most common and symptomatic

fused cornuate navicular

Answer 2

3 types

1

2

3

Question 3

mueller weiss mimics?

Answer 3

bipartite navicular

Question 4

situated adjacent to the postero lateral margin of the talus

appears as 2nd degree ossification center at 8 yrs, F (8-10) and M 11-18 yrs

Answer 4

Os Trigonum

Question 5

accessory center located in space between os calcis/calcaneous, talus, cuboid and navicular, bilateral

may bridge calcaneus and navicular, C-N coalition

variants may appear to articulate

Ddx from anterior beak fracture of os calcis (Rowe 1C)

Answer 5

Os Calcaneus Secondarium

Question 6

case reports of symptomatic os sustentaculum causing medial ankle pain 14 y/o male indicate case reports, T/F on exam; question reads:

there are no case reports of symptomatic os sustentaculum, T/F?

Answer 6

false

Question 7

clinically, double ankle; some resistance to STJ inversion and orthotic therapy indication for?

Answer 7

os sustentaculum

Question 8

one of the rarer accessory ossicles?

located where?

Answer 8

os cuboid secondarium

located plantar, not dorsal (plantar medial surface of cuboid)

Question 9

os intermetatarseum is located where?

Answer 9

dorsal base

Question 10

major characteristics of os vesalianum?

Answer 10

accessory epiphysis base of 5th metatarsal

lies parallel or oblique to met shaft

persistent apophysis follows contour of base

styloid process avulsion fx vs accessory bone

located at insertion of peroneus brevis tendon and not peroneus longus