Hand

Question 1

What is a boutonierre deformity?

Answer 1

PIP flexion with DIP extension. Due to Central slip rupture with attenuation of triangular ligament and volar subluxation of lateral bands.

Question 2

The juncturae tendinum may mask what injury?

Answer 2

Proximal extensor tendon lacerations

Question 3

What is the cortical ring sign of the scaphoid?

Answer 3

Seen in DISI. Means the scaphoid is flexed and you are seeing the volar tubercle on AP view.

Question 4

Which are the strongest fibers of the scapholunate ligament?

Answer 4

Dorsal fibers stronger

Question 5

Which are the strongest components of the lunotriquetral ligament?

Answer 5

Volar

Question 6

What view might help better appreciate ring and small finger cmc fx/dislocation?

Answer 6

Pronated 30 degree oblique radiograph

Question 7

What is a “baby” or “reverse” Bennett fx? Deforming force?

Answer 7

It is a small finger CMC fx/dislocation. Deforming force is ECU.

Question 8

How much angulation can be tolerated in thumb metacarpal fx?

Answer 8

Up to 30 degrees due to CMC compensatory joint motion

Question 9

What is a Bennett fracture?

Answer 9

An intra-articular fracture dislocation of base of thumb CMC joint.

Question 10

In a Bennet fx, what keeps the volar ulnar fragment reduced to trapezium?

Answer 10

The anterior oblique or “beak” ligament. Primary stabilizing restraint to subluxation of CMC joint