Scapulohumeral Rhythm

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=npXfyEZjXqs

In this video scapulohumeral rhythm is explained: • The full range of shoulder motion normally is combination between the motion in glenohumeral and scapulothoracic joint. • A natural rhythm/ratio between GH joint and scapulothoracic joint --- 2:1. • That’s means for every 2 deg of shoulder abduction/flexion, the scapula must upward rotate roughly 1 deg. (vice versa for adduction/extension). • The full ROM of shoulder abduction/flexion= 180 deg, which combination between 120 deg shoulder abduction/flexion + 60 deg scapular upward rotation. • Scapulothoracic (ST) Joint: Not a truth joint. • Articulating between anterior surface of scapula to posterior thorax (ribs 2-7). • ST joint Movements : permits scapular elevation/depression, protraction/retraction, upward/downward rotation. • Motion of ST joint is dependent on the combined movement of the acromioclavicular (AC) and sternoclavicular (SC) joint. • The full 60 deg ST joint upward rotation = 30 deg of SC joint elevation + 30 deg AC joint upward rotation • • • Scapulohumeral Rhythm

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