Shoulder Flashcards
what does glenohumeral joint rely on for stability
muscles and ligaments
joints of shoulder complex
sternoclavicular glenohumeral acromioclavicular coracoclavicular scapulothoracic
which ligament provides buffer for rotator cuff muscles
coracoacromial ligament
early stabilizers of humeral head during abduction/flexion
teres minor depresses head
late stabilizers of humeral head during abduction/flexion
subscapularis & infraspinatus
< 90, supraspinatus remains active
ratio of scapular movement to glenohumeral movement during flexion/abd
2:1
main contributors to adduction/extension with resistance
latissimus dorsi, teres major, sternal head of pec major
movements of scapula required for shoulder flexion/abd
protraction
elevation
upward rotation
(with posterior clavicular rotation)
movements of the scapula required for add/ext
retraction
depressoin
downward rotation
(with anterior clavicular rotation)
which rotator cuff muscles are weakest
external rotators: infraspinatus, teres minor
during follow through while pitching, which muscles are concentric/eccentric
IR muscles= concentric
ER muscles= eccentric
strongest –> weakest shoulder movements
adduction ext flex abd IR ER
which 2 muscles work together to upwardly rotate scapula
upper trap
lower trap
which 2 muscles work together to downwardly rotate scapula
rhomboids
levator scapulae
pectoralis minor
what should distances from inferior angle of scap to vertebral column and medial border of scap to vertebral column be for stability?
distance between inferior angle and vertebral column > medial border and vertebral column
