What is the scapulohumeral rhythm?
1:2 scapula:humerus
2:1 scapula:humerus
1:3 scapula:humerus
3:1 scapula:humerus
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2:1 scapula:humerus - Scapula must move 1 degree for every 2 degrees of humeral movement. Damage will occurs without 2:1 due to insufficient space for movement.
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