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The shoulder is a ball and socket joint. The ball is at the top of the upper arm bone (humerus) and the socket (glenoid) is part of the shoulder blade (scapula). When you lift your arm or reach overhead both parts of the joint are moving in a coordinated way to give you mobility. This is controlled by muscles.
What are they? The rotator cuff, deltoid and teres major muscles.
What do they do? These muscles rotate the shoulder joint and lift the arm.
What are they? The supraspinatus, infraspinatus, subscapularis and teres minor muscles.
What do they do?
What are they? These muscles include your upper, middle and lower trapezius muscles, the rhomboids, levator scapulae, serratus anterior and pectoralis minor muscles.
What do they do? These muscles control movement of the shoulder blade (scapula).
The scapulothoracic and scapulohumeral muscles work in a coordinated way to create normal painfree movement at the shoulder joint. In addition, they provide stability to the shoulder joint while you move.
Many factors can contribute to shoulder pain and/or can alter how we move: