1. How would loss of scapulohumeral rhythm affect normal shoulder functioning?
a. asynchronous action of scapula with humerus would lead to loss of glenohumeral joint stability and therefore lead to dislocation
b. asynchronous action of scapula with humerus would lead to decreased tension production of musculature connecting from trunk to humerus
c. shoulder function would not be affected
d. asynchronous action of scapula with humerus would result in decreased tension production of rotator cuff musculature due to change in length-tension relationship
2. What is the function of the rotator cuff?
a. to counter compressive forces generated by deltoid during active shoulder abduction
b. to counter rotary forces generated by deltoid during active shoulder abduction
c. to prevent the head of humerus from impinging on the transverse scapular notch
d. to depress the shoulder girdle
e. a & c
3. Which of the following factors contribute to maintaining the integrity (stability) of the glenohumeral joint?
a. line-of-pull of supraspinatus and other cuff muscles
b. obliquity of glenoid fossa
c. a & b
d. compressive force generated by deltoid
e. line-of-pull of biceps brachii long head
f. coracoacromial ligament
g. d & e
Posted November 3, 2000