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Shoulder biomechanics

SHOULDER KINEMATICS

SCAPULO-HUMERAL RHYTHM

The scapula must upwardly rotate to allow overhead activity.  

Scapulo-humeral rhythm= 

  • The first 45 degrees of humeral abduction is accompanied by movement of the scapula. 
  • For every 15 degrees of abduction that occurs there is 10 degrees at the gleno-humeral joint and 5 degrees at the scapulo-thoracic joint.  
  • The range of glenohumeral to scapulothoracic motion is 2:1
Loss of this smooth motion (normal scapulo-humeral rhythm) can result from alterations in the normal postural relationships of the humerus and scapula.

HUMERO-THORACIC RHYTHM

Represented by the Global Diagram

Global Diagram

The global diagram is an effective method for displaying humerothoracic positions because it allows presentation of both the planes of elevation ("longitudes") and the angles of elevation ("latitudes"). 

The details of humeral motions can be indicated on a global diagram as a series of points or arrows .



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