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The glenohumeral joint consists of 3 joints the: Acromioclavicular Joint (ACJ), Sternoclavicular Joint (SCJ) & Scapulo-Thoracic “Joint” (STJ)
The glenohumeral joint has no axial connection
Anatomical variations are generally poorly correlated to pain or pathology
The gleno-humeral ligaments and shoulder capsule provide stability proprioceptive feedback
The deltoid muscle abducts, flexes and extends the arm at the shoulder
The trapezius only elevates and depresses the scapular
Shoulder bursae are richly nociceptive
When a convex joint surface is moving, the roll and glide occur in the opposite direction.
Humeral Head glides inferiorly and translates superiorly during abduction
The rotator cuff muscles only work during internal & external rotation