Arm Flashcards

1
Q

what is a holstein-lewis fracture?

A

spiral fracture of the distal one-third of the humeral shaft, often a/w radial nerve neuropraxia

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2
Q

which muscle recovers first in a radial nerve palsy?

A

brachioradilais

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3
Q

which muscle recovers last in a radial nerve palsy?

A

extensor indicis

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4
Q

what structures are at risk in the anterior approach to the humerus?

A

proximal: axillary nerve, humeral circumflex artery
distal: radial nerve, musculocutaneous nerve

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5
Q

what structures are at risk in the lateral (Kocher) approach to the elbow?

A

PIN, radial nerve

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6
Q

what structures are at risk in the posterior approach to the elbow?

A

ulnar nerve

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7
Q

what is the terrible triad of the elbow?

A

coronoid fracture, radial head fracture, and elbow dislocation

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8
Q

what sort of instability is a/w a fracture of the anteromedial facet of the coronoid?

A

posteromedial rotatory instability

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9
Q

where are the forces typically directed to cause a terrible triad elbow injury?

A

valgus and supination

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10
Q

mason type 1 fracture

A

radial head, nondisplaced or minimally displaced (<2 mm), no mechanical block to rotation

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11
Q

mason type 2 fracture

A

radial head displaced >2 mm or angulated, possible mechanical block to rotation

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12
Q

mason type 3 fracture

A

radial head, comminuted and displaced, mechanical block to motion

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13
Q

mason type 4 fracture

A

radial head fracture with associated elbow dislocation

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14
Q

what is a greenspan view on xray?

A

radiocapitellar

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15
Q

where does the PIN cross the proximal radius?

A

anterior to posterior within the supinator muscle 4cm distal to the radial head

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16
Q

why do you rotate the forearm in the Kocher or Kaplan approach to the radial head?

A

to protect the PIN

17
Q

what is the interval for the Kocher approach to the radius?

A

ECU (PIN) and anconeus (radial)

18
Q

what is the interval for the Kaplan approach to the radius?

A

EDC (PIN) and ECRB (radial)

19
Q

most common direction for elbow dislocation

A

posterolateral

20
Q

what is a monteggia fracture?

A

proximal third ulnar fracture with radial head dislocation/instability

21
Q

what is a die-punch fracture?

A

depressed fracture of the lunate fossa of the articular surface of the distal radius

22
Q

what is a barton’s fracture?

A

fracture-dislocation of radiocarpal joint with intra-articular fracture involving the volar or dorsal lip

23
Q

what is a chauffer’s fracture?

A

radial styloid fracture

24
Q

what is a colles’ fracture?

A

low energy, dorsally displaced, extra-articular fracture

25
Q

what is a smith’s fracture?

A

low-energy, volarly displaces, extra-articular fracture

26
Q

what is the biggest predictor of instability in a distal radius fracture?

A

radial shortening

27
Q

what nerve is most likely to be injured with an ex-fix for a distal radius injury?

A

radial sensory nerve

28
Q

what tendon can rupture as a result of very distal plate placement in a distal radius fracture?

A

FPL

29
Q

what tendon can rupture months after a non-/minimally displaced distal radius fracture?

A

EPL

30
Q

how do you treat EPL rupture 2/2 nondisplaced distal radius fracture?

A

EIP transfer

31
Q

what is an essex-lopresti injury?

A

radial head fracture with an interosseus membrane injury extending to DRUJ

32
Q

what is a galezzi fracture?

A

distal 1/3 radius shaft fracture and DRUJ injury

33
Q

what is a nightstick fracture?

A

isolated ulnar shaft fracture

34
Q

what tendon can impede reduction of the DRUJ?

A

ECU

35
Q

what are the compartments of the forearm?

A

volar, dorsal, mobile wad