Shoulder Complex Flashcards
Synovial classification of sternoclavicular joint
sellar/saddle
Synovial classification of acromioclavicular joint
planar/gliding
Synovial classfication of glenohumeral joint
ball & socket
Synovial classification of scapulothoracic joint
pseudo-joint but necessary for full GH function
SC joint
Clavicle is ___________ superior-inferior & Manubrium is ___________ superior - inferior
convex
concave
SC joint
Clavicle is ________ anterior-posterior & manubrium is _________ anterior-posterior
concave
convex
Clavicle rolls & glides __________ during protraction of SC joint
anteriorly
Clavicle rolls & glides ____________ during retraction of SC joint
posteriorly
Clavicle rolls ______________ & glides _________ during elevation of SC joint
superiorly
inferiorly
Clavicle rolls __________ & glides _______ during depression of SC joint
inferiorly
superiorly
What direction does the AC joint glide during protraction & retraction of scapula?
anterior to posterior
Loose/open packed position of GH joint
55 deg abduction
30 deg horizontal adduction
Close packed position of GH joint
end range abduction and external rotation
During external rotation the GH joint rolls ____ and glides _____
posterior
anterior
During internal rotation the GH joint rolls _____ and glides _____
anterior
posterior
During flexion the GH joint rolls ____ and glides _____
superior
inferior
Shoulder flexion
Primary and secondary mover, and antagonist
Primary: Anterior deltoid
Secondary: Biceps brachii
Antagonist: Latissimus dorsi
Shoulder abduction
Primary and secondary mover, and antagonist
Primary: Middle deltoid
Secondary: supraspinatus
Antagonist: Pectoralis major
Shoulder adduction
Primary and secondary mover, and antagonist
Primary: latissimus dorsi
Secondary: teres minor
Antagonist: Middle deltoid
Shoulder internal rotation
Primary and secondary mover, and antagonist
Primary: subscapularis
Secondary: teres major
Antagonist: infraspinatus
Shoulder extension
Primary and secondary mover, and antagonist
Primary: posterior deltoid
Secondary: teres major
Antagonist: anterior deltoid
Shoulder external rotation
Primary and secondary mover, and antagonist
Primary: infraspinatus
Secondary: teres minor
Anatagonist: subscapularis
Scapular elevation
Primary and secondary mover, and antagonist
Primary: upper trapezius
Secondary: levator scapulae
Anatagonist: lower trapezius
Scapular depression
Primary and secondary mover, and antagonist
Primary: lower trapezius
Secondary: pectoralis minor
Antagonist: upper trapezius
Scapular protraction
Primary and secondary mover, and antagonist
Primary: serratus anterior
Secondary: pectoralis major
Antagonist: Middle trapezius
Scapular retraction
Primary and secondary mover, and antagonist
Primary: middle trapezius
Secondary: rhomboids
Antagonist: serratus anterior
Scapular upward rotation
Primary and secondary mover, and antagonist
Primary: serratus anterior
Secondary: upper/lower trapezius
Antagonist: latissimus dorsi
What does the articular disc in the sternoclavicular joint do?
Divides the joint in 2 to increase surface area, mobility, and shock absorption
What are the 3 purposes of scapulohumeral rhythm?
- allows for greater overall shoulder ROM
- maintains optimal contact between humeral head and glenoid fossa
- assists with maintaining an optimal length-tension relationship of the glenohumeral muscles (for stability)
Why does the glenohumeral joint have the greatest ROM?
shallow joint, extensive joint capsule, limited ligamentous support
What are the static stabilizers of the GH joint?
Labrum, ligaments, joint capsule
Function of labrum in GH joint
deepens socket
Dynamic stabilizers of GH joint
musculature (rotator cuff, deltoid)
Main function of rotator cuff muscles
pull head of humerus into glenoid fossa (centers head)
Primary function of deltoid
swing humerus
Explain force coupling in GH joint
Due to lever arm & muscle tone, the deltoid could pull humerus superiorly so the rotator cuff muscles have to activate before that to keep the humeral head centered in the glenoid fossa to prevent compression of structures in the subacromial space
