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.

Question

Quizplus · Accepted Answer

The scapulothoracic joint plays a crucial role in orienting the glenoid fossa for optimal contact with the humeral head during arm movement. It also provides stability and enhances the range of motion at the glenohumeral joint by controlling the position of the scapula. Downward rotation during shoulder girdle elevation is only one of the functions of the scapulothoracic joint. Decreasing stability at the AC and SC joints is not a desirable or functional outcome of scapulothoracic motion. Additionally, the scapulothoracic joint works in synergy with the glenohumeral joint to optimize shoulder movement.

The Ultimate Function of Motion at the Scapulothoracic Joint Is