Elbow Flashcards
(24 cards)
% of WB at ulna & radius joints
humeroulna: 40%
humeroradial: 60%
humeroulnar articulation for medial-lateral surface
convex ulna on concave trochlea
humeroulnar articulation for AP surface
concave ulna on convex trochlea
the trochlea is angled ____ to allow for more flexion and room for biceps
forward 45 deg
humeroradial articulation
concave radial read on convex capitellum of humerus
during elbow flexion: radial head glides ____ and extension ____
flexion: anterior
extension: posterior
which part of the interosseous membrane determines stability?
central band
which part of the interosseous membrane limits supination via passive tensioning?
dorsal oblique accessory cord
function of central band of interosseous membrane
- resist longitudinal and transverse displacement of radius relative to ulna
- load distribution b/w PRUJ & DRUJ
which part of the interosseous membrane requires surgery if injured?
central band
open pack of humeroulnar
70 deg flex
10 deg sup
open pack of radiohumeral
full ext
full sup
open pack of prox radioulnar
70 deg flex
35 deg sup
open pack of dist radioulnar
10 deg sup
closed pack of humeroulnar
full ext
full sup
closed pack of radiohumeral
90 deg flex
5 deg sup
closed pack of prox radioulnar
5 deg sup
closed pack of dist radioulnar
5 deg sup
prox radioulnar articulation
convex radial head on concave radial fossa of ulna
what ligament supports the prox radioulnar joint?
annular
prox radioulnar rolls and glides
pron: roll post, glide ant
sup: roll ant, glide post
the peak strain on the interosseous membrane’s central band occur when
neutral forearm rotation
main function of interosseous membrane
inhibit displacement of radial head from its superior articulation with the ulna
functional ROM of elbow
30-130 deg flex
50 deg of pron & sup
