Shoulder
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Introduction
Anatomy
The shoulder is composed of four articulations - the sternoclavicular, the acromioclavicular, the glenohumoral, and the scapulothoracic.
Anatomy and Movement
Movement of the shoulder are composed of three joints and one articulation: the sternoclavicular acromioclavicular, glenohumoral joints, and the scapulothoracic articulation.
Rotator cuff muscles and tendons help move the shoulder but play a more important role in its stabilization.
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Look and compare both sides
look at musculature of trapezius and rhomboids: look for atrophy
extension -45-50%
rotation - keep elbows on side, use both arms and go in and out.
brong hand up to to back of neck.
drop arm test - rotator cuff tears
impingement - wear of tendon against acromion
beer can maneuver
Bones of the Shoulder
Sternoclavicular Joint
The sc joint involves the clavicle and both the sternum and manubrium. A fibrocartilaginous disc and both anterior and posterior SC ligaments stabilize the joint.
Acromioclavicular Joint
The AC joint, together with the SC joint, are particularly involved with abduction and rotation.
Rotator Cuff
supraspinatus: abducts arm
teres minor: externally rotates
infraspinatus: externally rotates
subscapularis: internally rotates
Abduction
Up to 30 degrees, abduction is carried out primarily by the supraspinatus
Function
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Resources and References
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