Exam 2 Flashcards
Clavicular depression
15
Clavicular elevation
45-48
Clavicular protraction
15-20
Clavicular retraction
30
Clavicular post rotation
50
Scapula (ac) IR/ER
60
Scapula (ac) AP tipping
60
Normal resting position of scapula
10-20 anterior tilt
10-20 upward rotation
30-45 IR
Between T2-T7
Angle of inclination
Shaft of humerus in relation to head/neck
130-150
Angle of torsion
Condyles in relation to head/neck
30 retroversion
Anteversion
Less ER, more IR
Retro version
Increased ER, less IR
Movements of SC joint
Elevation/depression, protraction/retraction, posterior rotation
Ligaments of SC joint
Interclavicular, A/P sternoclavicular, costoclavicular
Function of interclavicular ligament
Prevent depression of lateral clavicle, limit superior translation of medial clavicle
Function of A/P sternoclavicular ligament
Medial clavicle protraction and retraction
Function of costoclavicular ligament
Resist excessive elevation and facilitates inferior glide
Anterior reduces lateral translation
Posterior reduces medial translation
Movements of AC joint
IR/ER, AP tipping, upward/downward rotation
Ligaments of AC joint
Superior and inferior AC ligaments, coracoclavicular ligament (conoid and trapezoid)
Function of superior and inferior AC ligaments
Approximate the two bones
Superior - limits anterior displacement of distal clavicle
Function of both coracoclavicular ligaments
Limit clavicle elevation and assist posterior rotation of clavicle
Function of trapezoid
Resist translation in AP direction and medial displacement of scapula
Function of conoid
Better resistor to superior movement of clavicle and inferior movements of scapula
Movements of scapulothoracic joint
Upward/downward rotation, elevation/depression, protraction/retraction
Functions of scapulothoracic joint
Orients glenoid, add range during elevation, good attachment for muscles, control subacromial space
Ligaments of glenohumeral joints
Superior glenohumeral, middle glenohumeral, inferior glenohumeral, coracohumeral
Function of superior glenohumeral joint
Resist anterior and inferior translation
Function of Middle glenohumeral
Resist anterior translation up to midrange
Function of inferior glenohumeral
Anterior - helps with external rotation. Resist anterior translation
Posterior - helps with internal rotation. Resist inferior translation
Pouch - resist anterior translation
Function of coracohumeral ligament
Assist with inferior trans at rest. Helps with ER and adduction
Deltoid EMG activity flexion/abduction
Flexion: continues to increase throughout range
Abduction: increase until 90 degrees then levels off and remains constant
Deltoid without scapular stabilizers
Scapula will downwardly rotate
Only 60-70 degrees of elevation
Deltoid without rotator cuff
Superior translation of humeral head
Shoulder shrug
Will see sixty degrees of elevation
Supraspinatus EMG activity
Increase up to 90 degrees and then plateaus
Greater than deltoid in first 60 degrees of abduction
Supraspinatus without deltoid
Full abduction but weak in nature
ITS EMG activity
Increases from 0-150 then activity decreases the rest of the way
Activity greater in flexion than abduction because supraspinatus active in abduction
