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Spring A 2025 > msk final > Flashcards

msk final Flashcards

1
Q

what movements does the humeroulnar joint help guide?

A

flexion and extension

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2
Q

what are the articulations of the HUJ?

A

trochlea and trochlear notch

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3
Q

what movement does valgus help with at the HUJ

A

extension
helps clear hips

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4
Q

what movement does varus help with at the HUJ?

A

flexion
helps with eating

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5
Q

does the HUJ follow cave on ves rules?

A

no

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6
Q

what does the deep concavity of the HUJ resrict?

A

traditional distraction - 45 deg
traditional cave on vex glide - posterior medial/lateral at 60 deg

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7
Q

what motion does posterior glide help at HRJ?

A

extension

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8
Q

what motion does anterior glide help at HRJ?

A

flexion

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9
Q

what are the articulations of HRJ?

A

capitulum and radial head

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10
Q

what movements does the humeroradial joint help guide?

A

flexion and extension
pronation and supination

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11
Q

what is the concavity of the HRJ?

A

cave on vex

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12
Q

what influence on the length of radius does the HRJ have?

A

posterior-medial radial head is thicker
in pronation, pushes radial distally

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13
Q

synkinetic with PRUJ

A

ext and pro go together
flex and sup go together

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14
Q

what are the articulations of PRUJ?

A

radial head and radial notch

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15
Q

what motions does the PRUJ help guide?

A

pro and sup

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16
Q

what is the concavity of PRUJ?

A

vex on cave

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17
Q

what motions does the DRUJ help guide?

A

pro and sup

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18
Q

how much force does TFCC absorb?

A

20%

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19
Q

what is the concavity of DRUJ?

A

cave on vex

least congruent in pronation
most congruent in supination

20
Q

what are common disruptions of DRUJ?

A

colles fracture:
malalignment and RU lig dysfunction

ulnar styloid fracture:
RU lig dysfunction

21
Q

what are the carpals intrinsically stabilized by?

A

form closure
force closure

22
Q

what is the arthrokinematics of carpals?

A

radiocarpal - vex on cave
mid-carpal - non traditional

23
Q

what is the scapholunate angle?

A

30-60 deg in the palmar direction
at risk during FOOSH

24
Q

tapeziometacarpal joint (CMC 1)

A

saddle joint
cave on vex in flex/ext
vex on cave in abd/add

25
Q

CMC 2&3

A

very rigid

26
Q

CMC 4&5

A

complex planar joint
allows flexion and extension of MC 4 & 5

27
Q

MCP joint

A

condyloid
allow abd and add
cave on vex

28
Q

IP joints

A

hinge joints
only flex/ext
cave on vex

29
Q

what side of arm are the flexors on?

A

anterior

30
Q

what flexors can jeopardize the median nerve?

A

FDS
FDP

31
Q

what flexor can crush the ulnar nerve in the cubital tunnel?

A

FCU

32
Q

what extensor muscle connects the ulna to the hand?

A

ECU

33
Q

what extensors are prone to lateral epicondlyopathy?

A

ECRB
ECRL

34
Q

what extensors make up part of the snuff box?

A

AbdPL
EPB

35
Q

what extensors form the extensor hood?

A

ED
EI
EDM

36
Q

clinical pearl of the lumbricals

A

on thumb side and come off of profundus
mechanical advantage of flexion
contribute to median nerve entrapment

37
Q

clinical pearl of interossei

A

attach on the side needed to perform their function
ulnar nerve

38
Q

overview of median nerve

A

sensation: palmar and dorsal distal 1-3
proximally compressed at pronator teres
distally compressed at carpal tunnel

39
Q

overview of radial nerve

A

sensation: dorsal 1-3
prox compressed at radial tunnel between two heads of supinator

40
Q

overview of ulnar nerve

A

sensation: dorsal and palmar 4-5
prox compressed at cubital tunnel
dis compressed at guyon’s canal

41
Q

what nerve is entrapped by anterior interosseous syndrome?

A

median

42
Q

what muscles are affected by AIS?

A

FPL
FDP (2,3)
PQ

43
Q

what is the presentation of AIS?

A

no snesory loss
weakness of tip pinch grasp
-unable to make ok sign
-unable to button shirts
possible pain at prox, medial forearm

44
Q

what nerve is entrapped in posterior interosseous syndrome?

A

radial nerve

45
Q

what muscles are impacted in PIS?

A

Supinator
ECRB
ED
EDM
ECU
AbdP
EPL
EPB
EI

46
Q

what is the presentation of PIS?

A

no sensory loss
weakness in MCP ext, some wrist ext
possible pain at radial tunnel
inability to create full open hand motion

Spring A 2025 (6 decks)

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