Distal Radius Fx

Question 1

What tests and associated nerves would you test on a PE of distal radius fx

Answer 1

• Thumbs up (posterior interosseous Nerve PIN)
• A ok sign (Anterior Interosseous Nerve AIN)
• Peace sign and crossing 2nd and 3rd finger (Ulnar N.)

Question 2

PIN is branch off what nerve

Answer 2

radial

Question 3

AIN is branch off what nerve

Answer 3

medial

Question 4

What is a colle’s fx

Answer 4

• Dorsally displaced distal radius fx
• Extraarticular, FOOSH injury
• Apex anterior and Dorsally angulated

Question 5

Frykman I and II

Answer 5

-Extra-articular radius (I)

+ ulnar styloid (II)

Question 6

Frykman III and IV

Answer 6

-Radiocarpal intraarticular (III)

+ ulnar styloid (IV)

Question 7

Frykman V and VI

Answer 7

-Radioulnar (V)

+ Ulnar styloid (VI)

Question 8

Frykman VII and VIII

Answer 8

-Radiocarpal (intraarticular) and radioulnar

+ulnar styloid (VIII)

Question 9

what eponym? Volar angulated extra-articular distal radius fx (from fall on a flexed wrist)

Answer 9

Smith

Question 10

What eponym? Radial styloid fx

Answer 10

Chauffer’s

Question 11

What eponym? Fracture dislocation of radiocarpal joint

Answer 11

Barton’s

Question 12

What eponym? Depressed fx of lunate fossa of the articular surface of the distal radius

Answer 12

Die-Punch

Question 13

What 3 values do you want to measure on a wrist xray and what values indicate surgery needed

Answer 13

• Radial inclination: >5 degree change
• Radial height: > 5 mm shortened
• Volar tilt: . . . Dorsal tilt >10 degree dorsal tilt
• Articular step off: >2 mm

Question 14

What is normal slope of radial inclination

Answer 14

22 degrees

Question 15

how do you measure radial height and what is normal

Answer 15

• two parallel lines that are perpendicular to the long axis of the radius
• one line at level of radial styloid and other at level of lunate fossa
• about 12 mm

Question 16

normal volar tilt

Answer 16

11 degress

Question 17

What are some prognostic indicators that can be used to predict an unfavorable outcome in a reduction of a distal radius fx . . Lafontains Criteria

Answer 17

• Intra-articular fx
• Dorsal comminution
• Dorsal angulation >20 deg
• Age > 60
• Associated ulnar fx

Question 18

What is the superficial interval for the modified henry approach to the wrist

Answer 18

-Flexor Carpi Radialis (FCR) and Radial nerve

Question 19

Which nerve is most commonly affected in distal radius fx

Answer 19

medial

Question 20

What is a common complication of closed reduction and casting immobilization of an extra-articular distal radius fx

Answer 20

-EPL rupture

Question 21

Improperly placing a volar plate distal to the watershed zone most commonly results in what complication?

Answer 21

FPL rupture