Chapter 96 - Wrist Fractures and Dislocations, Carpal Dissociation, and Distal Radius Fractures

Question 1

what ligamentous attachment is responsible for the triquetral avulsion fracture (dorsal)

Answer 1

dorsal radiotriquetral and triquetroscaphoid ligaments

Question 2

what ligamentous attachment is responsible for the triquetral avulsion fracture (palmar)

Answer 2

palmar ulnar triquetral ligament and lunotriqutral interosseous ligament ligament

Question 3

function of the palmar portion of the SL interosseous ligament

Answer 3

rotational control

Question 4

function of the dorsal portion of the SL interosseous ligament

Answer 4

strongest portion, translational control

Question 5

what deformity does scapholunate interosseous ligament injury lead to?

Answer 5

DISI - loss of the pull of the scaphoid (scaphoid wants to flex) causes the lunate to tip into extension creating DISI

Question 6

normal scapholunate angle?

Answer 6

45 degrees
>60 -> disi

Question 7

what does the signet ring sign indicate?

Answer 7

increased/unopposed scaphoid flexion

Question 8

what region of the lunotriquetral ligament is the strongest?

Answer 8

palmar
however the dosral LT ligament is most important in rotational constraint

Question 9

epl rupture is associated with what fracture pattern and time frame?

Answer 9

non displaced extraarticular distal radius fractures, 4-6 weeks after injury

Question 10

most common tendon rupture following volar plating of a distal radius fracture?

Answer 10

FPL
2/2 plate being placed to distal

Question 11

dorsal tendon rupture is 2/2 what?

Answer 11

too long of screws in volar plating