The ultimate function of motion at the scapulothoracic joint is to:
a. Orient the glenoid fossa for optimal contact with the humeral head when maneuvering the arm.
b. Provide downward rotation during shoulder girdle elevation.
c. Decrease stability at the acromioclavicular (AC) and sternoclavicular (SC) joints.
d. Work independent of the glenohumeral (GH) motion.
ANS: A
The scapulothoracic joint, although not a "true" joint, plays a significant role in the mobility and stability of general shoulder girdle motion. Its primary function is to provide optimal positioning of the glenoid fossa in order to add range to elevation of the arm and provide a stable base for controlled motion of the GH joint.
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