stress fx, lisfrac, navicular, talar fx

Question 1

how long before stress fx shows up on xray

Answer 1

10-21 days

Question 2

piano key test

Answer 2

lisfrancs injury. push down of mets 1-2 and elicit a pain response

Question 3

lisfrancs radiographi finding

Answer 3

fleck sign.

Question 4

Myerson (quneu/kus) classification

Answer 4

A. Total incongruity
B1. Partial incongruity isolateral. 1st goes medial
B2. Partial incongruity lessers go lateral
C1. Divergent (1st and 2nd)
C2. divergent all mets

Question 5

What part of the navicular is avascular

Answer 5

central 1/3

Question 6

Whatson and Jones Classification of Navicular fx

Answer 6

1. avulsion of tuberosity
2. dorsal lip fx
   3a coronal plane fx
   3b transverse fx and adducted
   3c comminution and abduction
   4 stress

Question 7

tx type one

Answer 7

<5mm displace=immbolize

>5mm ORIF

Question 8

Canale view

Answer 8

view of talus. foot plantarflexed pronated 15 degrees w tube head orientated 75 degrees cephalad

Question 9

lateral process talar fx

Answer 9

often mistaken for ankle sprain.

Snowboarders

Question 10

posterior process talar fx

Answer 10

nutcracker sign

Question 11

shepards fx

Answer 11

inversion injury of lateral tubercle

Question 12

Cedell fx

Answer 12

forced DF and pronation injury of medial tubercle or steida process

Question 13

Hawkins classification

Answer 13

1. minimal displacement w out joint 0-15% AVN
2. STJ 20-42% AVN
3. STJ and ankle 75-90% AVN
4. STJ, ankle, and TN- 100% AVN

Question 14

Hawkins Sign

Answer 14

radiolucency seen below sub-chondral plate of talar dome @ 6-8 wks
Presence mean you won’t get AVN

Question 15

Blair fusion

Answer 15

tibo-calcaneal arthrodesis of body of talus and sliding peg graft of tibia down into talus

Question 16

Talectomy

Answer 16

tib-calc arthrodesis