Shoulder girdle bones/movement Flashcards
What makes up the shoulder complex
shoulder gridle and glenohumeral joint
2 functions of the shoulder complex
Mobility vs stability
What provides SOME stability for the UE
girdle
Is movement of the girdle dependent on shoulder joint and muscles
NO. Movement is not
What kind of stability does the shoulder gridle have
Dynamic
Function of the shoulder complex
Mobility. Greatest mobility of any joint
What happens at the shoulder girdle during a bench press during the lowing phase
Horizontal Abduction
3 joints of the shoulder girdle
Sternoclavicular (SC)
acromioclavicular (AC)
scapulothoracic (ST)
Why does the scapula move on the rib cage
Joint motion occurring at the SC joint and less the AC joint
Osteology of the SC Sternoclavicular joint
Clavicle, sternum 1st rib
Joint type for sternoclavicular joint
Arthrodial ( plane synovial)
Degrees of freedom for sternoclavicular joint
three (3)
What is the only synovial articulation between the axial and appendicular skeleton?
Sternoclavicular joint
three Ligaments of the sternoclavicular joints
costoclavicular, sternoclavicular, interclavicular
has articulating disc
SC joint Osteokinematics planes of motion
F/T/”S”
What has a greater range of motion in the SC joint
Posterior rotation (30-70) is greatest, then elevation (45) with depression, protraction/retraction (15)
Is the SC joint often injured
not by macrotrauma–sprain or dislocation
Acromioclavicular joint osteology
acromion, distal end of clavicle
AC joint type
arthrodial–plane synovial
Degrees of freedom for AC joint
three (3)
What joint does the AC joint help
the SC joint’s little helper
AC joint Osteokinematics planes of motion
F/T/S 20-30 degree total gliding and rotation
Movements of the AC joint
upward/downward
medial/lateral rotation
Anterior/posterior tilting
Function of the AC joint
maintain congruency with the thorax
What is a sprain of the A/C joint
shoulder separation
injured more than SC joint
Scapulothoracic joint type
functional joint not synovial joint
What is the movement of the ST joint dependent on
depends on the AC and SC joints
What kind of support does the ST joint have
Dynamic support,
no ligaments
no synovial features
What is the holding forces for the ST joint
atmospheric pressure
ST joint osteology
Scapula and thorax
ST joint type
concave scapula with convex ribs
degrees of freedom of ST joint
0 because not joint
Osteokinematics for ST
confusing. elevation/depression protrat/retract up/down rotation med/lat rotation (winging) ant/post--tipping
ST joint motion
scapular elevation
what happens in scapular elevation
SC elevation
AC anterior tipping
scapular motion allows
optimal contact of humerus with glenoid fossa
added ROM to elevate arm
stable base for roll/slide humeral head
Joint actions (empty on card) fill in
Special motions (need to fill in)
at end of range of motion
What do protraction and retraction of the ST joint equal
abduction (pro)
adduction (re)
When does upward and downward motion of the ST joint occur
when arms are at the side and lifted straight out
when does elevation and depression of ST joint happen
when shrugging shoulders
Special motions of the ST joint
occur at the end of ROM
not visible during motion
Two special motions of the ST joint
winging
tipping
What is winging of the ST joint
medial/lateral rotation of the scapula
what is tipping of the ST joint
Anterior/posterior tipping of the scapula
putting arms from neutral position straight back
What happens at the shoulder girdle during the lifting phase of a bench press
Horizontal Adduction
