msk final Flashcards
(336 cards)
what movements does the humeroulnar joint help guide?
flexion and extension
what are the articulations of the HUJ?
trochlea and trochlear notch
what movement does valgus help with at the HUJ
extension
helps clear hips
what movement does varus help with at the HUJ?
flexion
helps with eating
does the HUJ follow cave on vex rules?
no
what does the deep concavity of the HUJ resrict?
traditional distraction - 45 deg
traditional cave on vex glide - posterior medial/lateral at 60 deg
what motion does posterior glide help at HRJ?
extension
what motion does anterior glide help at HRJ?
flexion
what are the articulations of HRJ?
capitulum and radial head
what movements does the humeroradial joint help guide?
flexion and extension
pronation and supination
what is the concavity of the HRJ?
cave on vex
what influence on the length of radius does the HRJ have?
posterior-medial radial head is thicker
in pronation, pushes radial distally
synkinetic with PRUJ
ext and pro go together
flex and sup go together
what are the articulations of PRUJ?
radial head and radial notch
what motions does the PRUJ help guide?
pro and sup
what is the concavity of PRUJ?
vex on cave
what motions does the DRUJ help guide?
pro and sup
how much force does TFCC absorb?
20%
what is the concavity of DRUJ?
cave on vex
least congruent in pronation
most congruent in supination
what are common disruptions of DRUJ?
colles fracture:
malalignment and RU lig dysfunction
ulnar styloid fracture:
RU lig dysfunction
what are the carpals intrinsically stabilized by?
form closure
force closure
what is the arthrokinematics of carpals?
radiocarpal - vex on cave
mid-carpal - non traditional
what is the scapholunate angle?
30-60 deg in the palmar direction
at risk during FOOSH
tapeziometacarpal joint (CMC 1)
saddle joint
cave on vex in flex/ext
vex on cave in abd/add