Rotator Cuff Flashcards
what kind of join is the glenohumeral joint?
synovial ball and socket joint
location of glenohumeral joint
between humeral head and glenoid cavity of scapula
what kind of movement does the glenohumeral joint provide?
multiaxial
what structures stabilize the glenohumeral joint?
rotator cuff muscles, extrascapular ligaments, long head of biceps brachii
what structure surrounds the glenohumeral joint? what is this structure composed of?
the musculotendinous collar (composed of joint capsule + tendons of rotator cuff)
what are the 4 muscles that make the rotator cuff?
supraspinatus
infraspinatus
subscapularis
teres minor
what is the function of the rotator cuff muscles?
stabilize humeral head in glenoid cavity
preserve arm flexibility
ROM
function of supraspinatus
arm adbuction
function of infraspinatus
humerus lateral rotation
origins and insertions of supraspinatus and infraspinatus
origin: 2 fossa above and below spina on posterior surface of scapula
insertion: greater tubercle of humerus
function of teres minor muscle
lateral rotation of humerus
origin and insertion of teres minor muscle
origin: flat pt of scapula
insertion: greater tubercle of humerus (proximal end of humerus)
subscapularis muscle function
medial rotation of arm @ glenohumeral joint
subscapularis origin and insertion
origin: subscapular fossa
insertion: lesser tubercle of humerus
what are some rotator cuff disorders?
impingement and tendinopathy
what muscle is commonly involved in rotator cuff disorders and why?
supraspinatus muscle b/c poor blood supply to supraspinatus tendon
what can cause impingement to rotator cuff? what movement is it felt most?
swelling of supraspinatus
excess fluid is subacromial/subdeltoid joint
subacromial bony spurs
felt most when abducting arm
repeat trauma to supraspinatus tendon can result in
degenerative changes in tendon like calcification which causes pain
tendon with degenerative changes is more susceptible to _____ (give ex)
trauma like: partial and full thickness tears
what type of supraspinatus tendon tear can be asymptomatic?
complete tear of supraspinatus tendon
pt has rotator cuff syndrome w/ impingementin supraspinatus muscle. what anatomical feature failed caused the injury? (3 possibilities)
subacromial bony spurs
swelling of supraspinatus
excess fluid in subacromial/subdeltoid bursa
role of subacromial bursa
failure of this structure can cause ____
protect muscle of rotator cuff. failure causes impingement
what structures stabilize glenohumeral joint? (3)
biceps brachii
joint capsule
musculotendinous collar
