If you sustain injury to the shoulder joint how they affect movement of the shoulder

Expert Solution

The shoulder joint is a ball and socket joint between the scapula and the humerus. It is the major joint connecting the upper limb to the trunk.

As a ball and socket synovial joint, there is a wide range of movement permitted:

Extension (upper limb backwards in sagittal plane) – posterior deltoid, latissimus dorsi and teres major.
Flexion (upper limb forwards in sagittal plane) – pectoralis major, anterior deltoid and coracobrachialis. Biceps brachii weakly assists in forward flexion.
Abduction (upper limb away from midline in coronal plane):
The first 0-15 degrees of abduction is produced by the supraspinatus.
The middle fibres of the deltoid are responsible for the next 15-90 degrees.
Past 90 degrees, the scapula needs to be rotated to achieve abduction – that is carried out by the trapezius and serratus anterior.
Adduction (upper limb towards midline in coronal plane) – pectoralis major, latissimus dorsi and teres major.
Internal rotation (rotation towards the midline, so that the thumb is pointing medially) – subscapularis, pectoralis major, latissimus dorsi, teres major and anterior deltoid.
External rotation (rotation away from the midline, so that the thumb is pointing laterally) – infraspinatus and teres minor.

All these movements mentioned above will be affected if sustained injury to the shoulder joint.

Sydney Mullin answered 2 years ago

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If you sustain injury to the shoulder joint how they affect movement of the shoulder

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Expert Solution

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