Abduction: Again, the thumb will lead and lift your straight arm out to the side to 90 degrees. Scaption: You will bring your arm up at a diagonal (in between flexion and abduction) with your thumbs up.
The infraspinatus and subscapularis have significant roles in scapular plane abduction (scaption), generating forces that are two to three times greater than supraspinatus force. However, the supraspinatus still remains a more effective shoulder abductor because of its more effective moment arm.
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