mod 3 shoulder Flashcards
(22 cards)
what is the biggest stabalizer of the scapulo thoracic jt
biggest stabalizer is the traps
3 motions of sc joint
- elevation/depression
- rot of the clavicle
- protraction/retraction
(all relative to lat end)
what is the axis of rot in elevation/depression
costoclavicular lig
as the clavical elevates what happens in rot
costoclavicular lig becomes taut and coracoclavicular lig making it roll post
function of the costoclavicular lig (2)
- checks sup glide
2. creates a pivot point for protraction/retraction
function of AC jt (2)
- maintain relation bw scap and clavical
2. provide 30 degrees extra rot in abduc
what direction does hurmeral head go
medial sup post
how much is the humeral head retroverted
30 degrees post
how big is the GHJ capsul and how much distraction does it allow for
twice the size of humerall head
allows for 1inch distraction
GH ligs- where is it strongest and what is closed pack
strong sup
abd and ext rot
what does the coracohumeral lig check against
external rot
why is there more ext rot in abducted pos compared to pendent
impact of lesser tubercle w int rot
why is there more int rot in abducted pos
impact of greater tub on ac
what keeps your arm from subluxing inf (3)
- sup capsul j
- coracohumeral lig
- passive tension in surpraspinatus
when the deltoid is paralazed abduction strength is decreased by how much at 0 and how much at 150
0- -35
150- 60-80
if trap is paralyzed abduction ROM is decreased to
75degrees
what happens in type 1 GH degredation
balding of humeral head
rounding of greater tubercle + bicipital groove
thinnijng acromion
GH:scapular motion ratio
2 degrees GH for 1 degree scap rot
is arm abduction what moves the 1st middle and last sections
30- Gh
middle- 1:1
last- scapulothoracic
What happens to the AIGHL and PIGHL in throwing athletes
AIGHL- becomes lax
PIGHL- contracture (helps not pinch rotator)
loose some int rot
what are negatives to throwing athletes (in extreme external rot)
peel back on biceps tendon
ant capsul becomes lax
Grade 1,2,3 of AC joint seperations
1- slight tearing all in tact tho
- ripping atleast thru one, step defect present
- ripping thru all 3 ligs
